Web Security Overview
Warning
HTTPS

Web sites need to use encryption to help their visitors know they're in the right place, as well as provide confidentiality and content integrity. Sites that don't support HTTPS may expose sensitive data and have their pages modified and subverted.
There are issues with this site's HTTPS configuration.

For all sites VERY IMPORTANT medium EFFORT
Supported and well configured
HTTPS Redirection

To deploy HTTPS properly, web sites must redirect all unsafe (plaintext) traffic to the encrypted variant. This approach ensures that no sensitive data is exposed and that further security technologies can be activated.

For all sites VERY IMPORTANT low EFFORT
Supported and well configured
HTTP Strict Transport Security

HTTP Strict Transport Security (HSTS) is an HTTPS extension that instructs browsers to remember sites that use encryption and enforce strict security requirements. Without HSTS, active network attacks are easy to carry out.

For important sites VERY IMPORTANT medium EFFORT
Supported and well configured
HSTS Preloaded

HSTS Preloading is informing browsers in advance about a site's use of HSTS, which means that strict security can be enforced even on the first visit. This approach provides best HTTPS security available today.

For important sites VERY IMPORTANT medium EFFORT
Supported and well configured
Content Security Policy

Content Security Policy (CSP) is an additional security layer that enables web sites to control browser behavior, creating a safety net that can counter attacks such as cross-site scripting.

For important sites IMPORTANT high EFFORT
Email Security Overview
Supported and well configured
STARTTLS

All hosts that receive email need encryption to ensure confidentiality of email messages. Email servers thus need to support STARTTLS, as well as provide decent TLS configuration and correct certificates.

For all sites VERY IMPORTANT low EFFORT
Supported and well configured
SPF

Sender Policy Framework (SPF) enables organizations to designate servers that are allowed to send email messages on their behalf. With SPF in place, spam is easier to identify.

For important sites IMPORTANT low EFFORT
Supported and well configured
DMARC

Domain-based Message Authentication, Reporting, and Conformance (DMARC) is a mechanism that allows organizations to specify how unauthenticated email (identified using SPF and DKIM) should be handled.

For important sites IMPORTANT low EFFORT

DNS Zone

The global DNS infrastructure is organized as a series of hierarchical DNS zones. The root zone hosts a number of global and country TLDs, which in turn host further zones that are delegated to their customers. Each organization that controls a zone can delegate parts of its namespace to other zones. In this test we perform detailed inspection of a DNS zone, but only if the host being tested matches the zone.

Test passed
Everything seems to be well configured. Well done.

Nameserver Names

Nameservers can be referred to by name and by address. In this section we show the names, which can appear in the NS records, the referrals from the parent zone, and the SOA record. In some situations, servers from the parent zone respond authoritatively, in which case we will include them in the list as well.

Nameserver Operational IPv4 IPv6 Sources
dns3.cloudns.net.
185.136.96.88
2a06:fb00:1::1:88
The server is online. Name resolves to an IPv4 address. Name resolves to an IPv6 address. REFERRAL NS
dns4.cloudns.net.
185.136.97.88
2a06:fb00:1::2:88
The server is online. Name resolves to an IPv4 address. Name resolves to an IPv6 address. REFERRAL NS
ns.jpberlin.de. PRIMARY
91.198.250.3
2001:67c:2050:1::53:1
The server is online. Name resolves to an IPv4 address. Name resolves to an IPv6 address. REFERRAL NS SOA
ns2.jpberlin.de.
194.150.191.56
The server is online. Name resolves to an IPv4 address. Name doesn't resolve to an IPv6 address. REFERRAL NS
ns3.jpberlin.de.
88.198.52.15
The server is online. Name resolves to an IPv4 address. Name doesn't resolve to an IPv6 address. REFERRAL NS

Nameserver Addresses

This section shows the configuration of all discovered nameservers by their IP address. To find all applicable nameservers, we inspect the parent zone nameservers for names and glue and then the tested zone nameservers for NS records. We then resolve all discovered names to IP addresses. Finally, we test each address individually.

Nameserver Operational Authoritative Recursive UDP TCP Sources Payload Size
185.136.96.88
dns3.cloudns.net.
PTR: dns3.cloudns.net.
The server appears to be online. Nameserver provides authoritative responses Nameserver doesn't provide recursive service Nameserver responds to UDP queries Nameserver responds to TCP queries NAME 4096
185.136.97.88
dns4.cloudns.net.
PTR: dns4.cloudns.net.
The server appears to be online. Nameserver provides authoritative responses Nameserver doesn't provide recursive service Nameserver responds to UDP queries Nameserver responds to TCP queries NAME 4096
194.150.191.56
ns2.jpberlin.de.
PTR: ns2.jpberlin.de.
The server appears to be online. Nameserver provides authoritative responses Nameserver doesn't provide recursive service Nameserver responds to UDP queries Nameserver responds to TCP queries NAME 1480
88.198.52.15
ns3.jpberlin.de.
PTR: ns3.jpberlin.de.
The server appears to be online. Nameserver provides authoritative responses Nameserver doesn't provide recursive service Nameserver responds to UDP queries Nameserver responds to TCP queries NAME 1232
91.198.250.3 PRIMARY
ns.jpberlin.de.
PTR: klugscheisser.jpberlin.de.
The server appears to be online. Nameserver provides authoritative responses Nameserver doesn't provide recursive service Nameserver responds to UDP queries Nameserver responds to TCP queries NAME 1480
2001:67c:2050:1::53:1 PRIMARY
ns.jpberlin.de.
PTR: ns.jpberlin.de.
The server appears to be online. Nameserver provides authoritative responses Nameserver doesn't provide recursive service Nameserver responds to UDP queries Nameserver responds to TCP queries NAME 1480
2a06:fb00:1::1:88
dns3.cloudns.net.
PTR: dns3.cloudns.net.
The server appears to be online. Nameserver provides authoritative responses Nameserver doesn't provide recursive service Nameserver responds to UDP queries Nameserver responds to TCP queries NAME 4096
2a06:fb00:1::2:88
dns4.cloudns.net.
PTR: dns4.cloudns.net.
The server appears to be online. Nameserver provides authoritative responses Nameserver doesn't provide recursive service Nameserver responds to UDP queries Nameserver responds to TCP queries NAME 4096

Start of Authority (SOA) Record

Start of Authority (SOA) records contain administrative information pertaining to one DNS zone, especially the configuration that's used for zone transfers between the primary nameserver and the secondaries. Only one SOA record should exist, with all nameservers providing the same information.

The domain name of the primary nameserver for the zone. Also known as MNAME.Primary nameserver ns.jpberlin.de.
Email address of the persons responsible for this zone. Also known as RNAME.Admin email root.jpberlin.de.
Zone serial or version number.Serial number 2014103667
The length of time secondary nameservers should wait before querying the primary for changes.Refresh interval 40,000 seconds (about 11 hours 6 minutes)
The length of time secondary nameservers should wait before querying an unresponsive primary again.Retry interval 7,200 seconds (about 2 hours)
The length of time after which secondary nameservers should stop responding to queries for a zone, assuming no updates were obtained from the primary.Expire interval 604,800 seconds (about 7 days)
TTL for purposes of negative response caching. Negative cache TTL 86,400 seconds (about 1 day)
Time To Live (TTL) indicates for how long a record remains valid. SOA record TTL 900 seconds (about 15 minutes)

Analysis

Powerup!
Nameserver A and AAAA records should have matching reverse records
According to RFC 1912, nameserver's PTR records must match their A and AAAA records to ensure maximum interoperability.
Powerup!
Improve IPv6 support
The Internet is in a slow transition to supporting IPv6 widely. Although at this time it is expected that most recursive DNS servers will use IPv4, adding support for IPv6 will enable transition to networks that use IPv6 exclusively.
Good
No problems detected with the zone configuration
Excellent. This DNS zone is in a good working order. No problems detected.

Backing DNS Queries

Below are all DNS queries we submitted during the zone inspection.

ID Server Transport Question Name Type Status

DNS Records

Correctly functioning name servers are necessary to hold and distribute information that's necessary for your domain name to operate correctly. Examples include converting names to IP addresses, determining where email should go, and so on. More recently, the DNS is being used to communicate email and other security policies.

Test passed
Everything seems to be well configured. Well done.

DNS Records

These are the results of individual DNS queries against your nameserver for common resource record types.

Name TTL Type Data
mailbox.org.     900 A 80.241.60.194            
www.mailbox.org.     900 A 80.241.60.194            
mailbox.org.     3600 AAAA 2001:67c:2050:106:0:0:443:194            
www.mailbox.org.     3600 AAAA 2001:67c:2050:106:0:0:443:194            
mailbox.org.     300 CAA 0 iodef "mailto:mail@heinlein-support.de"            
mailbox.org.     300 CAA 0 iodef "mailto:security@heinlein-support.de"            
mailbox.org.     300 CAA 0 issue "letsencrypt.org"            
mailbox.org.     300 CAA 0 issue "swisssign.com"            
mailbox.org.     300 CAA 0 issue "digicert.com"            
mailbox.org.     900 DNSKEY 256 3 7 BQEAAAABwcvTaaZokGcz2HFSgv+ixKiuypnYzA3z/pu9MlZ1XFD2qeN7KgVB/mmlvFKDUgKdraUV2m2KglZLzc4d8GoXTnpLDhcWVJx9et9tDYVUzzrXyW6SL/mEYUIoK9KvVP5gTUxU9eRr0qohT36SL7QdPR16Lig7jANGeCQKLsJNQ08=            
mailbox.org.     900 DNSKEY 256 3 10 BQEAAAAB1LEf+LUCBcflBj5sFAJiZnhv9WBP8lVkaau+VW9vVV4soJ/Q7UJz+pbhMPDFicgzArADejYML+zl8Lkn9vRRd+pu2iQ/vZnfpKQkuNCcd7eba4JSG24cO7TVLCdfsGJqvNgoN15mMUXKnTbhP+nFq9mfGIjKBTELekqkkYLl3zs=            
mailbox.org.     900 DNSKEY 257 3 7 AwEAAdAx4Z+YqK6hogFjzM7TddRVDK9lE5WY9qTmWRwxAHDWYOOVV4b/N6FksRFWXV3rXfMIiyXRfdzt1Lnwt3rS2v9nYRCNlg1FDLHGwyDwV/I0D6CwgeZbTX7PSOL4oR0nFE1BYCbE2bHckgVE33tDF5fasDU0jXF00T9DPAhO0rxj            
mailbox.org.     7200 MX 50 mx-n.mailbox.org.            
mailbox.org.     7200 MX 10 mx2.mailbox.org.            
mailbox.org.     7200 MX 10 mx1.mailbox.org.            
mailbox.org.     7200 MX 20 mx3.mailbox.org.            
mailbox.org.     300 NS ns3.jpberlin.de.            
mailbox.org.     300 NS dns4.cloudns.net.            
mailbox.org.     300 NS ns2.jpberlin.de.            
mailbox.org.     300 NS dns3.cloudns.net.            
mailbox.org.     300 NS ns.jpberlin.de.            
mailbox.org.     900 SOA ns.jpberlin.de. root.jpberlin.de. 2014103667 40000 7200 604800 86400            
_xmpp-client._tcp.mailbox.org.     300 SRV 0 5 5222 xmpp.mailbox.org.            
_xmpp-server._tcp.mailbox.org.     300 SRV 0 5 5269 xmpp.mailbox.org.            
mailbox.org.     300 TXT "mailru-verification: 0c2c482975b1fc2f"            
mailbox.org.     300 TXT "swisssign-check=1tuXIQOBa4NZh2EIQI5nFD8fbJW2EvxB6W8rYhAoQ5"            
mailbox.org.     300 TXT "have-i-been-pwned-verification=aa98600469e4f52f5b4c8e6952a0927d"            
mailbox.org.     300 TXT "google-site-verification=ojrG-cXIWNDWMmRomplDCsZknBUmg2PO32SffP1Xy2E"            
mailbox.org.     300 TXT "v=spf1 ip4:213.203.238.0/25 ip4:195.10.208.0/24 ip4:91.198.250.0/24 ip4:80.241.56.0/21 ip6:2001:67c:2050::/48 mx ~all"            
mailbox.org.     300 TXT "google-site-verification=bCdtsEmyfsVIfzBgWZpEvCf3TeJgpw0f6x5miXGwakY"            
_dmarc.mailbox.org.     3600 TXT "v=DMARC1; p=reject; adkim=r; aspf=r; pct=100; rua=mailto:abuse+arf@heinlein-support.de; rf=afrf; fo=1;"            
_mta-sts.mailbox.org.     300 TXT "v=STSv1;" "id=20181001090000"            
_smtp._tls.mailbox.org.     300 TXT "v=TLSRPTv1;" "rua=mailto:p.heinlein@heinlein-support.de"            

Backing DNS Queries

Below are all DNS queries we submitted while we inspecting the resource records.

ID Server Question Name Type Status

DNSSEC

DNSSEC is an extension of the DNS protocol that provides cryptographic assurance of the authenticity and integrity of responses; it's intended as a defense against network attackers who are able to manipulate DNS to redirect their victims to servers of their choice. DNSSEC is controversial, with the industry split largely between those who think it's essential and those who believe that it's problematic and unnecessary.

Test passed
Everything seems to be well configured. Well done.

Analysis

Good
DNSSEC is well configured
Good. This domain name has well-configured DNSSEC.

Useful DNSSEC Tools

Certification Authority Authorization

CAA (RFC 8659) is a new standard that allows domain name owners to restrict which CAs are allowed to issue certificates for their domains. This can help to reduce the chance of misissuance, either accidentally or maliciously. In September 2017, CAA became mandatory for CAs to implement.

Test passed
Everything seems to be well configured. Well done.

CAA Policy Information

The DNS hostname where this policy is located.Policy host mailbox.org
The issue property tag is used to request that certificate
issuers perform CAA issue restriction processing for the domain
and to grant authorization to specific certificate issuers.
issue
swisssign.com  flags: 0
The issue property tag is used to request that certificate
issuers perform CAA issue restriction processing for the domain
and to grant authorization to specific certificate issuers.
issue
letsencrypt.org  flags: 0
The iodef property specifies a means of reporting certificate
issue requests or cases of certificate issue for the corresponding
domain that violate the security policy of the issuer or the domain
name holder.
iodef
mailto:security@heinlein-support.de  flags: 0
The iodef property specifies a means of reporting certificate
issue requests or cases of certificate issue for the corresponding
domain that violate the security policy of the issuer or the domain
name holder.
iodef
mailto:mail@heinlein-support.de  flags: 0
The issue property tag is used to request that certificate
issuers perform CAA issue restriction processing for the domain
and to grant authorization to specific certificate issuers.
issue
digicert.com  flags: 0

Analysis

Good
CAA policy found
Good. This domain name uses CAA to restrict which CAs are allowed to issue certificates for it.
Good
Policy uses reporting
Great. This policy uses reporting, which means that your contact information is available should someone need to contact you about a CAA violation. Do note that you're not guaranteed to be notified, given that CAs generally don't support notifications yet.

Email (SMTP)

An internet hostname can be served by zero or more mail servers, as specified by MX (mail exchange) DNS resource records. Each server can further resolve to multiple IP addresses, for example to handle IPv4 and IPv6 clients. Thus, in practice, hosts that wish to receive email reliably are supported by many endpoint.

Test passed
Everything seems to be well configured. Well done.
Some TLS and PKI information shown may have been retrieved from cache. The notes provide more information.
Server Preference Operational STARTTLS TLS PKI DNSSEC DANE
mx1.mailbox.org
2001:67c:2050:104:0:1:25:1
PTR: mx1.mailbox.org
10
220 mx1.mailbox.org ESMTP Postfix

EHLO outbound.hardenize.com
250-mx1.mailbox.org
250-PIPELINING
250-SIZE 143699726
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 CHUNKING

STARTTLS
220 2.0.0 Ready to start TLS
Supports STARTTLS.
mx1.mailbox.org
80.241.60.212
PTR: mx1.mailbox.org
10
220 mx1.mailbox.org ESMTP Postfix

EHLO outbound.hardenize.com
250-mx1.mailbox.org
250-PIPELINING
250-SIZE 143699726
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 CHUNKING

STARTTLS
220 2.0.0 Ready to start TLS
Supports STARTTLS.
mx2.mailbox.org
2001:67c:2050:104:0:2:25:1
PTR: mx2.mailbox.org
10
220 mx2.mailbox.org ESMTP Postfix

EHLO outbound.hardenize.com
250-mx2.mailbox.org
250-PIPELINING
250-SIZE 143699726
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 CHUNKING

STARTTLS
220 2.0.0 Ready to start TLS
Supports STARTTLS.
mx2.mailbox.org
80.241.60.215
PTR: mx2.mailbox.org
10
220 mx2.mailbox.org ESMTP Postfix

EHLO outbound.hardenize.com
250-mx2.mailbox.org
250-PIPELINING
250-SIZE 143699726
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 CHUNKING

STARTTLS
220 2.0.0 Ready to start TLS
Supports STARTTLS.
mx3.mailbox.org
2001:67c:2050:104:0:3:25:1
PTR: mx3.mailbox.org
20
220 mx3.mailbox.org ESMTP Postfix

EHLO outbound.hardenize.com
250-mx3.mailbox.org
250-PIPELINING
250-SIZE 143699726
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 CHUNKING

STARTTLS
220 2.0.0 Ready to start TLS
Supports STARTTLS.
mx3.mailbox.org
80.241.60.216
PTR: mx3.mailbox.org
20
220 mx3.mailbox.org ESMTP Postfix

EHLO outbound.hardenize.com
250-mx3.mailbox.org
250-PIPELINING
250-SIZE 143699726
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 CHUNKING

STARTTLS
220 2.0.0 Ready to start TLS
Supports STARTTLS.
mx-n.mailbox.org
91.198.250.17
PTR: mx-n.mailbox.org
50
220 mx1.mailbox.org ESMTP Postfix

EHLO outbound.hardenize.com
250-mx1.mailbox.org
250-PIPELINING
250-SIZE 143699726
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 CHUNKING

STARTTLS
220 2.0.0 Ready to start TLS
Supports STARTTLS.

Analysis

Good
Email servers match MTA-STS policy
Good. This host supports MTA-STS, which means that it restricts which MX servers can be used and how they are configured. We've verified that all MX servers listed here match the policy.
Notice
Some SMTP server assessments have been retrieved from cache
Some SMTP server assessment results have been retrieved from our cache. Because many hosts point to the same SMTP servers, we use a short-term cache to avoid testing the same SMTP servers over and over again.

Latest cache timestamp: 13 Aug 2022 17:27 UTC

Earliest cache timestamp: 12 Aug 2022 18:26 UTC

Email TLS (SMTP)

Transport Layer Security (TLS) is the most widely used encryption protocol on the Internet. In combination with valid certificates, servers can establish trusted communication channels even with users who have never visited them before. Network attackers can't uncover what is being communicated, even when they can see all the traffic.

Test passed
Everything seems to be well configured. Well done.
Some TLS and PKI information shown may have been retrieved from cache. The notes provide more information.

TLS Configuration: mx1.mailbox.org (2001:67c:2050:104:0:1:25:1) Cached

Encryption protocol version determines what features are
available for negotiation between client and server.
Supported protocols
TLS v1.3
TLS v1.2
TLS v1.1
TLS v1.0
Servers should always enforce their own cipher
suite preference, as that is the only approach
that guarantees that the best possible suite is
selected.
Server suite preference
Shows cipher suite configuration for this protocol version.TLS v1.3
Server preference
Suite: TLS_AES_256_GCM_SHA384
Suite ID: 0x1302
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_CHACHA20_POLY1305_SHA256
Suite ID: 0x1303
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_AES_128_GCM_SHA256
Suite ID: 0x1301
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Shows cipher suite configuration for this protocol version.TLS v1.2
Server preference
Suite: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xcca8
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xccaa
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0xc030
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA384
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0xc02f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA384
TLS_RSA_WITH_AES_256_GCM_SHA384
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x3c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CBC_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_DHE_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a3
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM_8
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CCM
Suite ID: 0xc09f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a2
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM_8
 128 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM
Suite ID: 0xc09e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
Suite ID: 0xc028
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x6b
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0xc027
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x67
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a1
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM_8
 256 bits
Suite: TLS_RSA_WITH_AES_256_CCM
Suite ID: 0xc09d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM
 256 bits
Suite: TLS_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_GCM_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a0
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM_8
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM
Suite ID: 0xc09c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x3d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CBC_SHA256
 256 bits
Shows cipher suite configuration for this protocol version.TLS v1.1
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Shows cipher suite configuration for this protocol version.TLS v1.0
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
These results have been retrieved from
our cache. This row indicates when was
that the original test ran.
Retrieved from cache
12 Aug 2022 18:26 UTC

Analysis

Notice
Deprecated TLS 1.0 protocol supported
TLS 1.0 is a weak older protocol that should be phased out. Sites that aim at a wide audience might still need to support TLS 1.0 for the time being, because many older clients don't support newer protocol versions. Sites with a modern user base might be able to disable TLS 1.0 even now. We recommend that you enable logging of encryption parameters, after which you can examine your protocol usage and make decisions with confidence.
Good
TLS 1.2 supported
Good. This server supports TLS 1.2, which can provide strong security when configured correctly. This version of the TLS protocol is necessary to provide good security with a wide range of clients that don't yet support TLS 1.3.
Good
Server enforces cipher suite preferences
Excellent. This server enforces server cipher suite preference, which means that it is able to select the best suite from the options submitted by clients. Combined with a well designed list of supported cipher suites, this settings enables negotiation of best security.
Good
Strong key exchange detected
Excellent. All cipher suites on this server rely on strong key exchange. The sweet spot is 2048 bits for DHE and 256 bits for ECDHE. Putting ECDHE suites first guarantees best security and best performance.
Good
Server prefers forward secrecy and authenticated encryption suites
Excellent. Not only does this server enforce its server preference, but it also has at the top of the list suites that support both forward secrecy and authenticated encryption. This is the best TLS 1.2 can offer.
Notice
Relaxed TLS assessment criteria applied to SMTP on port 25
We apply relaxed assessment criteria when evaluating TLS configuration of SMTP servers on port 25. This is because most delivery agents fall back to delivering via plaintext on failure to negotiate encryption. Some configuration elements that can be abused to attack other ports and protocols (e.g., SSLv2 and export cipher suites) are penalized in the same way as for other protocols. We will review this policy in the future.
Good
DHE server parameter not reused
This server does not reuse the private value used for the Diffie-Hellman key exchange.

TLS Configuration: mx1.mailbox.org (80.241.60.212) Cached

Encryption protocol version determines what features are
available for negotiation between client and server.
Supported protocols
TLS v1.3
TLS v1.2
TLS v1.1
TLS v1.0
Servers should always enforce their own cipher
suite preference, as that is the only approach
that guarantees that the best possible suite is
selected.
Server suite preference
Shows cipher suite configuration for this protocol version.TLS v1.3
Server preference
Suite: TLS_AES_256_GCM_SHA384
Suite ID: 0x1302
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_CHACHA20_POLY1305_SHA256
Suite ID: 0x1303
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_AES_128_GCM_SHA256
Suite ID: 0x1301
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Shows cipher suite configuration for this protocol version.TLS v1.2
Server preference
Suite: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xcca8
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xccaa
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0xc030
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA384
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0xc02f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA384
TLS_RSA_WITH_AES_256_GCM_SHA384
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x3c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CBC_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_DHE_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a3
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM_8
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CCM
Suite ID: 0xc09f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a2
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM_8
 128 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM
Suite ID: 0xc09e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
Suite ID: 0xc028
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x6b
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0xc027
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x67
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a1
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM_8
 256 bits
Suite: TLS_RSA_WITH_AES_256_CCM
Suite ID: 0xc09d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM
 256 bits
Suite: TLS_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_GCM_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a0
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM_8
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM
Suite ID: 0xc09c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x3d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CBC_SHA256
 256 bits
Shows cipher suite configuration for this protocol version.TLS v1.1
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Shows cipher suite configuration for this protocol version.TLS v1.0
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
These results have been retrieved from
our cache. This row indicates when was
that the original test ran.
Retrieved from cache
12 Aug 2022 19:28 UTC

Analysis

Notice
Deprecated TLS 1.0 protocol supported
TLS 1.0 is a weak older protocol that should be phased out. Sites that aim at a wide audience might still need to support TLS 1.0 for the time being, because many older clients don't support newer protocol versions. Sites with a modern user base might be able to disable TLS 1.0 even now. We recommend that you enable logging of encryption parameters, after which you can examine your protocol usage and make decisions with confidence.
Good
TLS 1.2 supported
Good. This server supports TLS 1.2, which can provide strong security when configured correctly. This version of the TLS protocol is necessary to provide good security with a wide range of clients that don't yet support TLS 1.3.
Good
Server enforces cipher suite preferences
Excellent. This server enforces server cipher suite preference, which means that it is able to select the best suite from the options submitted by clients. Combined with a well designed list of supported cipher suites, this settings enables negotiation of best security.
Good
Strong key exchange detected
Excellent. All cipher suites on this server rely on strong key exchange. The sweet spot is 2048 bits for DHE and 256 bits for ECDHE. Putting ECDHE suites first guarantees best security and best performance.
Good
Server prefers forward secrecy and authenticated encryption suites
Excellent. Not only does this server enforce its server preference, but it also has at the top of the list suites that support both forward secrecy and authenticated encryption. This is the best TLS 1.2 can offer.
Notice
Relaxed TLS assessment criteria applied to SMTP on port 25
We apply relaxed assessment criteria when evaluating TLS configuration of SMTP servers on port 25. This is because most delivery agents fall back to delivering via plaintext on failure to negotiate encryption. Some configuration elements that can be abused to attack other ports and protocols (e.g., SSLv2 and export cipher suites) are penalized in the same way as for other protocols. We will review this policy in the future.
Good
DHE server parameter not reused
This server does not reuse the private value used for the Diffie-Hellman key exchange.

TLS Configuration: mx2.mailbox.org (2001:67c:2050:104:0:2:25:1) Cached

Encryption protocol version determines what features are
available for negotiation between client and server.
Supported protocols
TLS v1.3
TLS v1.2
TLS v1.1
TLS v1.0
Servers should always enforce their own cipher
suite preference, as that is the only approach
that guarantees that the best possible suite is
selected.
Server suite preference
Shows cipher suite configuration for this protocol version.TLS v1.3
Server preference
Suite: TLS_AES_256_GCM_SHA384
Suite ID: 0x1302
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_CHACHA20_POLY1305_SHA256
Suite ID: 0x1303
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_AES_128_GCM_SHA256
Suite ID: 0x1301
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Shows cipher suite configuration for this protocol version.TLS v1.2
Server preference
Suite: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xcca8
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xccaa
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0xc030
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA384
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0xc02f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA384
TLS_RSA_WITH_AES_256_GCM_SHA384
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x3c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CBC_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_DHE_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a3
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM_8
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CCM
Suite ID: 0xc09f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a2
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM_8
 128 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM
Suite ID: 0xc09e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
Suite ID: 0xc028
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x6b
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0xc027
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x67
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a1
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM_8
 256 bits
Suite: TLS_RSA_WITH_AES_256_CCM
Suite ID: 0xc09d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM
 256 bits
Suite: TLS_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_GCM_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a0
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM_8
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM
Suite ID: 0xc09c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x3d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CBC_SHA256
 256 bits
Shows cipher suite configuration for this protocol version.TLS v1.1
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Shows cipher suite configuration for this protocol version.TLS v1.0
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
These results have been retrieved from
our cache. This row indicates when was
that the original test ran.
Retrieved from cache
13 Aug 2022 17:27 UTC

Analysis

Notice
Deprecated TLS 1.0 protocol supported
TLS 1.0 is a weak older protocol that should be phased out. Sites that aim at a wide audience might still need to support TLS 1.0 for the time being, because many older clients don't support newer protocol versions. Sites with a modern user base might be able to disable TLS 1.0 even now. We recommend that you enable logging of encryption parameters, after which you can examine your protocol usage and make decisions with confidence.
Good
TLS 1.2 supported
Good. This server supports TLS 1.2, which can provide strong security when configured correctly. This version of the TLS protocol is necessary to provide good security with a wide range of clients that don't yet support TLS 1.3.
Good
Server enforces cipher suite preferences
Excellent. This server enforces server cipher suite preference, which means that it is able to select the best suite from the options submitted by clients. Combined with a well designed list of supported cipher suites, this settings enables negotiation of best security.
Good
Strong key exchange detected
Excellent. All cipher suites on this server rely on strong key exchange. The sweet spot is 2048 bits for DHE and 256 bits for ECDHE. Putting ECDHE suites first guarantees best security and best performance.
Good
Server prefers forward secrecy and authenticated encryption suites
Excellent. Not only does this server enforce its server preference, but it also has at the top of the list suites that support both forward secrecy and authenticated encryption. This is the best TLS 1.2 can offer.
Notice
Relaxed TLS assessment criteria applied to SMTP on port 25
We apply relaxed assessment criteria when evaluating TLS configuration of SMTP servers on port 25. This is because most delivery agents fall back to delivering via plaintext on failure to negotiate encryption. Some configuration elements that can be abused to attack other ports and protocols (e.g., SSLv2 and export cipher suites) are penalized in the same way as for other protocols. We will review this policy in the future.
Good
DHE server parameter not reused
This server does not reuse the private value used for the Diffie-Hellman key exchange.

TLS Configuration: mx2.mailbox.org (80.241.60.215) Cached

Encryption protocol version determines what features are
available for negotiation between client and server.
Supported protocols
TLS v1.3
TLS v1.2
TLS v1.1
TLS v1.0
Servers should always enforce their own cipher
suite preference, as that is the only approach
that guarantees that the best possible suite is
selected.
Server suite preference
Shows cipher suite configuration for this protocol version.TLS v1.3
Server preference
Suite: TLS_AES_256_GCM_SHA384
Suite ID: 0x1302
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_CHACHA20_POLY1305_SHA256
Suite ID: 0x1303
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_AES_128_GCM_SHA256
Suite ID: 0x1301
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Shows cipher suite configuration for this protocol version.TLS v1.2
Server preference
Suite: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xcca8
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xccaa
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0xc030
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA384
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0xc02f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA384
TLS_RSA_WITH_AES_256_GCM_SHA384
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x3c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CBC_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_DHE_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a3
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM_8
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CCM
Suite ID: 0xc09f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a2
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM_8
 128 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM
Suite ID: 0xc09e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
Suite ID: 0xc028
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x6b
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0xc027
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x67
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a1
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM_8
 256 bits
Suite: TLS_RSA_WITH_AES_256_CCM
Suite ID: 0xc09d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM
 256 bits
Suite: TLS_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_GCM_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a0
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM_8
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM
Suite ID: 0xc09c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x3d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CBC_SHA256
 256 bits
Shows cipher suite configuration for this protocol version.TLS v1.1
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Shows cipher suite configuration for this protocol version.TLS v1.0
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
These results have been retrieved from
our cache. This row indicates when was
that the original test ran.
Retrieved from cache
12 Aug 2022 21:33 UTC

Analysis

Notice
Deprecated TLS 1.0 protocol supported
TLS 1.0 is a weak older protocol that should be phased out. Sites that aim at a wide audience might still need to support TLS 1.0 for the time being, because many older clients don't support newer protocol versions. Sites with a modern user base might be able to disable TLS 1.0 even now. We recommend that you enable logging of encryption parameters, after which you can examine your protocol usage and make decisions with confidence.
Good
TLS 1.2 supported
Good. This server supports TLS 1.2, which can provide strong security when configured correctly. This version of the TLS protocol is necessary to provide good security with a wide range of clients that don't yet support TLS 1.3.
Good
Server enforces cipher suite preferences
Excellent. This server enforces server cipher suite preference, which means that it is able to select the best suite from the options submitted by clients. Combined with a well designed list of supported cipher suites, this settings enables negotiation of best security.
Good
Strong key exchange detected
Excellent. All cipher suites on this server rely on strong key exchange. The sweet spot is 2048 bits for DHE and 256 bits for ECDHE. Putting ECDHE suites first guarantees best security and best performance.
Good
Server prefers forward secrecy and authenticated encryption suites
Excellent. Not only does this server enforce its server preference, but it also has at the top of the list suites that support both forward secrecy and authenticated encryption. This is the best TLS 1.2 can offer.
Notice
Relaxed TLS assessment criteria applied to SMTP on port 25
We apply relaxed assessment criteria when evaluating TLS configuration of SMTP servers on port 25. This is because most delivery agents fall back to delivering via plaintext on failure to negotiate encryption. Some configuration elements that can be abused to attack other ports and protocols (e.g., SSLv2 and export cipher suites) are penalized in the same way as for other protocols. We will review this policy in the future.
Good
DHE server parameter not reused
This server does not reuse the private value used for the Diffie-Hellman key exchange.

TLS Configuration: mx3.mailbox.org (2001:67c:2050:104:0:3:25:1) Cached

Encryption protocol version determines what features are
available for negotiation between client and server.
Supported protocols
TLS v1.3
TLS v1.2
TLS v1.1
TLS v1.0
Servers should always enforce their own cipher
suite preference, as that is the only approach
that guarantees that the best possible suite is
selected.
Server suite preference
Shows cipher suite configuration for this protocol version.TLS v1.3
Server preference
Suite: TLS_AES_256_GCM_SHA384
Suite ID: 0x1302
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_CHACHA20_POLY1305_SHA256
Suite ID: 0x1303
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_AES_128_GCM_SHA256
Suite ID: 0x1301
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Shows cipher suite configuration for this protocol version.TLS v1.2
Server preference
Suite: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xcca8
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xccaa
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0xc030
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA384
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0xc02f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA384
TLS_RSA_WITH_AES_256_GCM_SHA384
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x3c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CBC_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_DHE_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a3
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM_8
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CCM
Suite ID: 0xc09f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a2
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM_8
 128 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM
Suite ID: 0xc09e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
Suite ID: 0xc028
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x6b
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0xc027
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x67
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a1
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM_8
 256 bits
Suite: TLS_RSA_WITH_AES_256_CCM
Suite ID: 0xc09d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM
 256 bits
Suite: TLS_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_GCM_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a0
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM_8
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM
Suite ID: 0xc09c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x3d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CBC_SHA256
 256 bits
Shows cipher suite configuration for this protocol version.TLS v1.1
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Shows cipher suite configuration for this protocol version.TLS v1.0
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
These results have been retrieved from
our cache. This row indicates when was
that the original test ran.
Retrieved from cache
13 Aug 2022 16:24 UTC

Analysis

Notice
Deprecated TLS 1.0 protocol supported
TLS 1.0 is a weak older protocol that should be phased out. Sites that aim at a wide audience might still need to support TLS 1.0 for the time being, because many older clients don't support newer protocol versions. Sites with a modern user base might be able to disable TLS 1.0 even now. We recommend that you enable logging of encryption parameters, after which you can examine your protocol usage and make decisions with confidence.
Good
TLS 1.2 supported
Good. This server supports TLS 1.2, which can provide strong security when configured correctly. This version of the TLS protocol is necessary to provide good security with a wide range of clients that don't yet support TLS 1.3.
Good
Server enforces cipher suite preferences
Excellent. This server enforces server cipher suite preference, which means that it is able to select the best suite from the options submitted by clients. Combined with a well designed list of supported cipher suites, this settings enables negotiation of best security.
Good
Strong key exchange detected
Excellent. All cipher suites on this server rely on strong key exchange. The sweet spot is 2048 bits for DHE and 256 bits for ECDHE. Putting ECDHE suites first guarantees best security and best performance.
Good
Server prefers forward secrecy and authenticated encryption suites
Excellent. Not only does this server enforce its server preference, but it also has at the top of the list suites that support both forward secrecy and authenticated encryption. This is the best TLS 1.2 can offer.
Notice
Relaxed TLS assessment criteria applied to SMTP on port 25
We apply relaxed assessment criteria when evaluating TLS configuration of SMTP servers on port 25. This is because most delivery agents fall back to delivering via plaintext on failure to negotiate encryption. Some configuration elements that can be abused to attack other ports and protocols (e.g., SSLv2 and export cipher suites) are penalized in the same way as for other protocols. We will review this policy in the future.
Good
DHE server parameter not reused
This server does not reuse the private value used for the Diffie-Hellman key exchange.

TLS Configuration: mx3.mailbox.org (80.241.60.216) Cached

Encryption protocol version determines what features are
available for negotiation between client and server.
Supported protocols
TLS v1.3
TLS v1.2
TLS v1.1
TLS v1.0
Servers should always enforce their own cipher
suite preference, as that is the only approach
that guarantees that the best possible suite is
selected.
Server suite preference
Shows cipher suite configuration for this protocol version.TLS v1.3
Server preference
Suite: TLS_AES_256_GCM_SHA384
Suite ID: 0x1302
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_CHACHA20_POLY1305_SHA256
Suite ID: 0x1303
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_AES_128_GCM_SHA256
Suite ID: 0x1301
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Shows cipher suite configuration for this protocol version.TLS v1.2
Server preference
Suite: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xcca8
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xccaa
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0xc030
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA384
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0xc02f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA384
TLS_RSA_WITH_AES_256_GCM_SHA384
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x3c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CBC_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_DHE_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a3
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM_8
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CCM
Suite ID: 0xc09f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a2
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM_8
 128 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM
Suite ID: 0xc09e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
Suite ID: 0xc028
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x6b
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0xc027
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x67
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a1
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM_8
 256 bits
Suite: TLS_RSA_WITH_AES_256_CCM
Suite ID: 0xc09d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM
 256 bits
Suite: TLS_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_GCM_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a0
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM_8
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM
Suite ID: 0xc09c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x3d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CBC_SHA256
 256 bits
Shows cipher suite configuration for this protocol version.TLS v1.1
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Shows cipher suite configuration for this protocol version.TLS v1.0
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
These results have been retrieved from
our cache. This row indicates when was
that the original test ran.
Retrieved from cache
12 Aug 2022 22:35 UTC

Analysis

Notice
Deprecated TLS 1.0 protocol supported
TLS 1.0 is a weak older protocol that should be phased out. Sites that aim at a wide audience might still need to support TLS 1.0 for the time being, because many older clients don't support newer protocol versions. Sites with a modern user base might be able to disable TLS 1.0 even now. We recommend that you enable logging of encryption parameters, after which you can examine your protocol usage and make decisions with confidence.
Good
TLS 1.2 supported
Good. This server supports TLS 1.2, which can provide strong security when configured correctly. This version of the TLS protocol is necessary to provide good security with a wide range of clients that don't yet support TLS 1.3.
Good
Server enforces cipher suite preferences
Excellent. This server enforces server cipher suite preference, which means that it is able to select the best suite from the options submitted by clients. Combined with a well designed list of supported cipher suites, this settings enables negotiation of best security.
Good
Strong key exchange detected
Excellent. All cipher suites on this server rely on strong key exchange. The sweet spot is 2048 bits for DHE and 256 bits for ECDHE. Putting ECDHE suites first guarantees best security and best performance.
Good
Server prefers forward secrecy and authenticated encryption suites
Excellent. Not only does this server enforce its server preference, but it also has at the top of the list suites that support both forward secrecy and authenticated encryption. This is the best TLS 1.2 can offer.
Notice
Relaxed TLS assessment criteria applied to SMTP on port 25
We apply relaxed assessment criteria when evaluating TLS configuration of SMTP servers on port 25. This is because most delivery agents fall back to delivering via plaintext on failure to negotiate encryption. Some configuration elements that can be abused to attack other ports and protocols (e.g., SSLv2 and export cipher suites) are penalized in the same way as for other protocols. We will review this policy in the future.
Good
DHE server parameter not reused
This server does not reuse the private value used for the Diffie-Hellman key exchange.

TLS Configuration: mx-n.mailbox.org (91.198.250.17) Cached

Encryption protocol version determines what features are
available for negotiation between client and server.
Supported protocols
TLS v1.3
TLS v1.2
TLS v1.1
TLS v1.0
Servers should always enforce their own cipher
suite preference, as that is the only approach
that guarantees that the best possible suite is
selected.
Server suite preference
Shows cipher suite configuration for this protocol version.TLS v1.3
Server preference
Suite: TLS_AES_256_GCM_SHA384
Suite ID: 0x1302
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_CHACHA20_POLY1305_SHA256
Suite ID: 0x1303
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_AES_128_GCM_SHA256
Suite ID: 0x1301
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: secp384r1
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Shows cipher suite configuration for this protocol version.TLS v1.2
Server preference
Suite: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xcca8
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
Suite ID: 0xccaa
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0xc030
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA384
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0xc02f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_GCM_SHA384
Suite ID: 0x9d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA384
TLS_RSA_WITH_AES_256_GCM_SHA384
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x3c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CBC_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_DHE_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a3
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM_8
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CCM
Suite ID: 0xc09f
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CCM
 256 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a2
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM_8
 128 bits (DHE 4096 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CCM
Suite ID: 0xc09e
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CCM
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
Suite ID: 0xc028
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x6b
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0xc027
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
Suite ID: 0x67
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA256
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
 128 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Suite: TLS_RSA_WITH_AES_256_CCM_8
Suite ID: 0xc0a1
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM_8
 256 bits
Suite: TLS_RSA_WITH_AES_256_CCM
Suite ID: 0xc09d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CCM
 256 bits
Suite: TLS_RSA_WITH_AES_128_GCM_SHA256
Suite ID: 0x9c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_GCM_SHA256
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM_8
Suite ID: 0xc0a0
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM_8
 128 bits
Suite: TLS_RSA_WITH_AES_128_CCM
Suite ID: 0xc09c
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_128_CCM
 128 bits
Suite: TLS_RSA_WITH_AES_256_CBC_SHA256
Suite ID: 0x3d
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA256
TLS_RSA_WITH_AES_256_CBC_SHA256
 256 bits
Shows cipher suite configuration for this protocol version.TLS v1.1
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
Shows cipher suite configuration for this protocol version.TLS v1.0
Server preference
Suite: TLS_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x35
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_256_CBC_SHA
 256 bits
Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x2f
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: RSA
Key exchange strength: 4096 bits
Forward secrecy: No (WEAK)
PRF: SHA
TLS_RSA_WITH_AES_128_CBC_SHA
 128 bits
Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0xc014
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA
Suite ID: 0x39
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
 256 bits (DHE 4096 bits)
Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0xc013
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: ECDHE_RSA
Key exchange strength: EC secp384r1 (384 bits)
Forward secrecy: Yes
PRF: SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (ECDHE 384 bits)
Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA
Suite ID: 0x33
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: CBC
Key exchange: DHE_RSA
Key exchange strength: 4096 bits
Forward secrecy: Yes
PRF: SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
 128 bits (DHE 4096 bits)
These results have been retrieved from
our cache. This row indicates when was
that the original test ran.
Retrieved from cache
12 Aug 2022 23:37 UTC

Analysis

Notice
Deprecated TLS 1.0 protocol supported
TLS 1.0 is a weak older protocol that should be phased out. Sites that aim at a wide audience might still need to support TLS 1.0 for the time being, because many older clients don't support newer protocol versions. Sites with a modern user base might be able to disable TLS 1.0 even now. We recommend that you enable logging of encryption parameters, after which you can examine your protocol usage and make decisions with confidence.
Good
TLS 1.2 supported
Good. This server supports TLS 1.2, which can provide strong security when configured correctly. This version of the TLS protocol is necessary to provide good security with a wide range of clients that don't yet support TLS 1.3.
Good
Server enforces cipher suite preferences
Excellent. This server enforces server cipher suite preference, which means that it is able to select the best suite from the options submitted by clients. Combined with a well designed list of supported cipher suites, this settings enables negotiation of best security.
Good
Strong key exchange detected
Excellent. All cipher suites on this server rely on strong key exchange. The sweet spot is 2048 bits for DHE and 256 bits for ECDHE. Putting ECDHE suites first guarantees best security and best performance.
Good
Server prefers forward secrecy and authenticated encryption suites
Excellent. Not only does this server enforce its server preference, but it also has at the top of the list suites that support both forward secrecy and authenticated encryption. This is the best TLS 1.2 can offer.
Notice
Relaxed TLS assessment criteria applied to SMTP on port 25
We apply relaxed assessment criteria when evaluating TLS configuration of SMTP servers on port 25. This is because most delivery agents fall back to delivering via plaintext on failure to negotiate encryption. Some configuration elements that can be abused to attack other ports and protocols (e.g., SSLv2 and export cipher suites) are penalized in the same way as for other protocols. We will review this policy in the future.
Good
DHE server parameter not reused
This server does not reuse the private value used for the Diffie-Hellman key exchange.

Email Certificates (SMTP)

A certificate is a digital document that contains a public key, some information about the entity associated with it, and a digital signature from the certificate issuer. It’s a mechanism that enables us to exchange, store, and use public keys. Being able to reliably verify the identity of a remote server is crucial in order to achieve secure encrypted communication.

Test passed
Everything seems to be well configured. Well done.
Some TLS and PKI information shown may have been retrieved from cache. The notes provide more information.

Certificate #1  Cached

Leaf certificate *.mailbox.org
Issuer: DigiCert
Not Before: 16 May 2022 00:00:00 UTC
Not After: 09 Jun 2023 23:59:59 UTC (expires in 9 months 24 days)
Key: RSA 4096 bits
Signature: SHA256withRSA
 View details

Analysis

Good
Strong private key
Good. The private key associated with this certificate is secure.
Good
Strong signature algorithm
Good. This certificate uses a strong signature algorithm.
Good
Certificate matches hostname
Good. The provided certificate matches the expected hostnames.
Good
Certificate dates match
Good. The certificate is valid for use at this point of time.
Good
Certificate has not been revoked
Good. This certificate has not been revoked.
Good
Certificate satisfies Apple's CT compliance requirements
Good. This certificate satisfies Apple's CT requirements at present.
Notice
Symantec subordinate CA excluded from early expiration
Although the leaf certificate ultimately chains to a Symantec root, it has been issued from an independently-operated subordinate CA that has been excluded from early expiration.

Certificate Chain

Leaf certificate
*.mailbox.org | 1cb1573
Not After: 09 Jun 2023 23:59:59 UTC (expires in 9 months 24 days)
Authentication: RSA 4096 bits (SHA256withRSA)
 View details
Intermediate certificate
Thawte TLS RSA CA G1 | 4bcc5e2
Not After: 02 Nov 2027 12:24:25 UTC (expires in 5 years 2 months)
Authentication: RSA 2048 bits (SHA256withRSA)
 View details
Root certificate
DigiCert Global Root G2 | cb3ccbb
Not After: 15 Jan 2038 12:00:00 UTC (expires in 15 years 4 months)
Authentication: RSA 2048 bits (SHA256withRSA)
 View details

Analysis

Good
Certificate chain is correct
Good. This chain contains all the right certificates and in the right order.

Email DANE (SMTP)

DNS-based Authentication of Named Entities (DANE) is a bridge between DNSSEC and TLS. In one possible scenario, DANE can be used for public key pinning, building on an existing publicly-trusted certificate. In another approach, it can be used to completely bypass the CA ecosystem and establish trust using DNSSEC alone.

Test passed
Everything seems to be well configured. Well done.
Some TLS and PKI information shown may have been retrieved from cache. The notes provide more information.

DANE: mx1.mailbox.org (2001:67c:2050:104:0:1:25:1)

Specifies which certificate in the chain
is being pinned and how validation should
be performed.
Certificate Usage
Domain-issued certificate / DANE-EE (3) Creates a leaf pin for a certificate that must be
present in the certificate chain. PKIX validation is
not performed and the pinned certificate is assumed
to be trusted.
Determines if the association is made with
a certificate or with a public key (via
its SPKI structure).
Selector
SPKI structure (1)
Determines how matching is done; directly or via a hash. Matching Type SHA2-256 (1)
Contains the data necessary to perform the matching. Data 996ad31d65e03f038b8ec950f6f26611529da03e3a283e4400cba2edd04b8a88

Leaf certificate: RSA 4096 bits
Subject: CN=*.mailbox.org
Issuer: CN=Thawte TLS RSA CA G1, OU=www.digicert.com, O=DigiCert Inc, C=US
*.mailbox.org (RSA 4096 bits)

Analysis

Good
Valid DANE configuration
Excellent. Your DANE configuration matches the certificate chain(s) provided by the service. Your TLS configuration enjoys the additional benefit of DANE validation.

DANE: mx1.mailbox.org (80.241.60.212)

Specifies which certificate in the chain
is being pinned and how validation should
be performed.
Certificate Usage
Domain-issued certificate / DANE-EE (3) Creates a leaf pin for a certificate that must be
present in the certificate chain. PKIX validation is
not performed and the pinned certificate is assumed
to be trusted.
Determines if the association is made with
a certificate or with a public key (via
its SPKI structure).
Selector
SPKI structure (1)
Determines how matching is done; directly or via a hash. Matching Type SHA2-256 (1)
Contains the data necessary to perform the matching. Data 996ad31d65e03f038b8ec950f6f26611529da03e3a283e4400cba2edd04b8a88

Leaf certificate: RSA 4096 bits
Subject: CN=*.mailbox.org
Issuer: CN=Thawte TLS RSA CA G1, OU=www.digicert.com, O=DigiCert Inc, C=US
*.mailbox.org (RSA 4096 bits)

Analysis

Good
Valid DANE configuration
Excellent. Your DANE configuration matches the certificate chain(s) provided by the service. Your TLS configuration enjoys the additional benefit of DANE validation.

DANE: mx2.mailbox.org (2001:67c:2050:104:0:2:25:1)

Specifies which certificate in the chain
is being pinned and how validation should
be performed.
Certificate Usage
Domain-issued certificate / DANE-EE (3) Creates a leaf pin for a certificate that must be
present in the certificate chain. PKIX validation is
not performed and the pinned certificate is assumed
to be trusted.
Determines if the association is made with
a certificate or with a public key (via
its SPKI structure).
Selector
SPKI structure (1)
Determines how matching is done; directly or via a hash. Matching Type SHA2-256 (1)
Contains the data necessary to perform the matching. Data 996ad31d65e03f038b8ec950f6f26611529da03e3a283e4400cba2edd04b8a88

Leaf certificate: RSA 4096 bits
Subject: CN=*.mailbox.org
Issuer: CN=Thawte TLS RSA CA G1, OU=www.digicert.com, O=DigiCert Inc, C=US
*.mailbox.org (RSA 4096 bits)

Analysis

Good
Valid DANE configuration
Excellent. Your DANE configuration matches the certificate chain(s) provided by the service. Your TLS configuration enjoys the additional benefit of DANE validation.

DANE: mx2.mailbox.org (80.241.60.215)

Specifies which certificate in the chain
is being pinned and how validation should
be performed.
Certificate Usage
Domain-issued certificate / DANE-EE (3) Creates a leaf pin for a certificate that must be
present in the certificate chain. PKIX validation is
not performed and the pinned certificate is assumed
to be trusted.
Determines if the association is made with
a certificate or with a public key (via
its SPKI structure).
Selector
SPKI structure (1)
Determines how matching is done; directly or via a hash. Matching Type SHA2-256 (1)
Contains the data necessary to perform the matching. Data 996ad31d65e03f038b8ec950f6f26611529da03e3a283e4400cba2edd04b8a88

Leaf certificate: RSA 4096 bits
Subject: CN=*.mailbox.org
Issuer: CN=Thawte TLS RSA CA G1, OU=www.digicert.com, O=DigiCert Inc, C=US
*.mailbox.org (RSA 4096 bits)

Analysis

Good
Valid DANE configuration
Excellent. Your DANE configuration matches the certificate chain(s) provided by the service. Your TLS configuration enjoys the additional benefit of DANE validation.

DANE: mx3.mailbox.org (2001:67c:2050:104:0:3:25:1)

Specifies which certificate in the chain
is being pinned and how validation should
be performed.
Certificate Usage
Domain-issued certificate / DANE-EE (3) Creates a leaf pin for a certificate that must be
present in the certificate chain. PKIX validation is
not performed and the pinned certificate is assumed
to be trusted.
Determines if the association is made with
a certificate or with a public key (via
its SPKI structure).
Selector
SPKI structure (1)
Determines how matching is done; directly or via a hash. Matching Type SHA2-256 (1)
Contains the data necessary to perform the matching. Data 996ad31d65e03f038b8ec950f6f26611529da03e3a283e4400cba2edd04b8a88

Leaf certificate: RSA 4096 bits
Subject: CN=*.mailbox.org
Issuer: CN=Thawte TLS RSA CA G1, OU=www.digicert.com, O=DigiCert Inc, C=US
*.mailbox.org (RSA 4096 bits)

Analysis

Good
Valid DANE configuration
Excellent. Your DANE configuration matches the certificate chain(s) provided by the service. Your TLS configuration enjoys the additional benefit of DANE validation.

DANE: mx3.mailbox.org (80.241.60.216)

Specifies which certificate in the chain
is being pinned and how validation should
be performed.
Certificate Usage
Domain-issued certificate / DANE-EE (3) Creates a leaf pin for a certificate that must be
present in the certificate chain. PKIX validation is
not performed and the pinned certificate is assumed
to be trusted.
Determines if the association is made with
a certificate or with a public key (via
its SPKI structure).
Selector
SPKI structure (1)
Determines how matching is done; directly or via a hash. Matching Type SHA2-256 (1)
Contains the data necessary to perform the matching. Data 996ad31d65e03f038b8ec950f6f26611529da03e3a283e4400cba2edd04b8a88

Leaf certificate: RSA 4096 bits
Subject: CN=*.mailbox.org
Issuer: CN=Thawte TLS RSA CA G1, OU=www.digicert.com, O=DigiCert Inc, C=US
*.mailbox.org (RSA 4096 bits)

Analysis

Good
Valid DANE configuration
Excellent. Your DANE configuration matches the certificate chain(s) provided by the service. Your TLS configuration enjoys the additional benefit of DANE validation.

DANE: mx-n.mailbox.org (91.198.250.17)

Specifies which certificate in the chain
is being pinned and how validation should
be performed.
Certificate Usage
Domain-issued certificate / DANE-EE (3) Creates a leaf pin for a certificate that must be
present in the certificate chain. PKIX validation is
not performed and the pinned certificate is assumed
to be trusted.
Determines if the association is made with
a certificate or with a public key (via
its SPKI structure).
Selector
SPKI structure (1)
Determines how matching is done; directly or via a hash. Matching Type SHA2-256 (1)
Contains the data necessary to perform the matching. Data 996ad31d65e03f038b8ec950f6f26611529da03e3a283e4400cba2edd04b8a88

Leaf certificate: RSA 4096 bits
Subject: CN=*.mailbox.org
Issuer: CN=Thawte TLS RSA CA G1, OU=www.digicert.com, O=DigiCert Inc, C=US
*.mailbox.org (RSA 4096 bits)

Specifies which certificate in the chain
is being pinned and how validation should
be performed.
Certificate Usage
Domain-issued certificate / DANE-EE (3) Creates a leaf pin for a certificate that must be
present in the certificate chain. PKIX validation is
not performed and the pinned certificate is assumed
to be trusted.
Determines if the association is made with
a certificate or with a public key (via
its SPKI structure).
Selector
SPKI structure (1)
Determines how matching is done; directly or via a hash. Matching Type SHA2-256 (1)
Contains the data necessary to perform the matching. Data 4758af6f02dfb5dc8795fa402e77a8a0486af5e85d2ca60c294476aadc40b220

Analysis

Good
Valid DANE configuration
Excellent. Your DANE configuration matches the certificate chain(s) provided by the service. Your TLS configuration enjoys the additional benefit of DANE validation.

SPF

Sender Policy Framework (SPF) is a protocol that allows domain name owners to control which internet hosts are allowed to send email on their behalf. This simple mechanism can be used to reduce the effect of email spoofing and cut down on spam.

Test passed
Everything seems to be well configured. Well done.

SPF Policy Information Main policy

Host where this policy is located.Location mailbox.org
SPF version used by this policy.v spf1
This mechanism tests whether the IP address being
tested is contained within a given IPv4 network.
ip4
213.203.238.0/25
This mechanism tests whether the IP address being
tested is contained within a given IPv4 network.
ip4
195.10.208.0/24
This mechanism tests whether the IP address being
tested is contained within a given IPv4 network.
ip4
91.198.250.0/24
This mechanism tests whether the IP address being
tested is contained within a given IPv4 network.
ip4
80.241.56.0/21
This mechanism tests whether the IP address being
tested is contained within a given IPv6 network.
ip6
2001:67c:2050::/48
This mechanism matches if the sending IP address
is one of the MX hosts for the domain name.
mx
This policy element always matches. It's normally used
at the end of a policy to specify the handling of hosts
that don't match earlier mechanisms.
~all

Analysis

Info
SPF policy found

Policy text: v=spf1 ip4:213.203.238.0/25 ip4:195.10.208.0/24 ip4:91.198.250.0/24 ip4:80.241.56.0/21 ip6:2001:67c:2050::/48 mx ~all

Location: mailbox.org

Good
SPF policy is valid
Good. Your SPF policy is valid.
Good
Policy DNS lookups under limit
Good. Your policy stays under the limit of up to 10 DNS queries. The SPF specification Section 4.6.4. requires implementations to limit the total number of DNS queries. Policies that exceed the limit should not be used and may not work in practice.

Lookups: 1

DMARC

Domain-based Message Authentication, Reporting, and Conformance (DMARC) is a scalable mechanism by which a mail-originating organization can express domain-level policies and preferences for message validation, disposition, and reporting, that a mail-receiving organization can use to improve mail handling.

Test passed
Everything seems to be well configured. Well done.

DMARC Policy Information

The location from which we obtained this policy.Policy location _dmarc.mailbox.org
DMARC version used by this policy.v DMARC1
Indicates the policy to be enacted by the receiver at
the request of the domain owner. Possible values are:
none, quarantine, and reject.
p
reject
Indicates whether strict or relaxed DKIM
alignment mode is required.
adkim
r
Indicates whether strict or relaxed SPF
alignment mode is required.
aspf
r
Percentage of messages from mail stream to
which the DMARC policy is to be applied.
pct
100
Addresses to which aggregate feedback is to be sent.rua mailto:abuse+arf@heinlein-support.de
Specifies the format to be used when reporting failures.rf afrf
Configures failure reporting.fo 1

Analysis

Info
DMARC policy found

Policy: v=DMARC1; p=reject; adkim=r; aspf=r; pct=100; rua=mailto:abuse+arf@heinlein-support.de; rf=afrf; fo=1;

Host: _dmarc.mailbox.org

Good
Valid external destination

Permission record location: mailbox.org._report._dmarc.heinlein-support.de

External destination: mailto:abuse+arf@heinlein-support.de

Permission record contents: v=DMARC1

Good
Policy is valid
Good. You have a valid DMARC policy.

MTA Strict Transport Security

SMTP Mail Transfer Agent Strict Transport Security (MTA-STS) is a mechanism enabling mail service providers to declare their ability to receive Transport Layer Security (TLS) secure SMTP connections, and to specify whether sending SMTP servers should refuse to deliver to MX hosts that do not offer TLS with a trusted server certificate.

Test passed
Everything seems to be well configured. Well done.

MTA-STS Policy Indicator

Location from which we retrieved the policy indicator.Location _mta-sts.mailbox.org
MTA-STS standard version used by this policy indicator.Version STSv1
Unique policy identifier, whose value must change
every time the underlying policy changes.
ID
20181001090000

Analysis

Good
MTA-STS policy indicator valid
Good. Your MTA-STS policy indicator is valid.

MTA-STS Policy

The URL from which the policy was obtained.Location https://mta-sts.mailbox.org/.well-known/mta-sts.txt
Policy standard version.version STSv1
Policy duration, which specifies how long the sending
MTAs should remember and enforce the server policy for.
max‑age
2,419,200 seconds (about 28 days)
Policy mode, which can be one of 'none', 'testing' and
'enforcing'. Guess which is best! :)
mode
enforce
One 'mx' directive specifies one email server
pattern that's allowed for this host.
mx
*.mailbox.org
One 'mx' directive specifies one email server
pattern that's allowed for this host.
mx
mx1.mailbox.org
One 'mx' directive specifies one email server
pattern that's allowed for this host.
mx
mx2.mailbox.org
One 'mx' directive specifies one email server
pattern that's allowed for this host.
mx
mx3.mailbox.org
One 'mx' directive specifies one email server
pattern that's allowed for this host.
mx
mxtls1.mailbox.org
One 'mx' directive specifies one email server
pattern that's allowed for this host.
mx
mxtls2.mailbox.org

Analysis

Good
MTA-STS policy is valid
Good. Your MTA-STS policy is valid.
Good
Policy host certificate is valid
Good. Your MTA-STS policy is delivered via a web server that has a valid publicly trusted certificate. This is a necessary condition for the policy to be recognized.
Notice
Policy HTTPS response information

Status code: 200

Length: 170 bytes

Content-Type: text/plain

Certificate: mta-sts.mailbox.org

Leaf certificate *.mailbox.org
Issuer: DigiCert
Not Before: 16 May 2022 00:00:00 UTC
Not After: 09 Jun 2023 23:59:59 UTC (expires in 9 months 24 days)
Key: RSA 4096 bits
Signature: SHA256withRSA
 View details

Analysis

Good
Strong private key
Good. The private key associated with this certificate is secure.
Good
Strong signature algorithm
Good. This certificate uses a strong signature algorithm.
Good
Certificate matches hostname
Good. The provided certificate matches the expected hostnames.
Good
Certificate dates match
Good. The certificate is valid for use at this point of time.
Good
Certificate has not been revoked
Good. This certificate has not been revoked.
Good
Certificate satisfies Apple's CT compliance requirements
Good. This certificate satisfies Apple's CT requirements at present.
Notice
Symantec subordinate CA excluded from early expiration
Although the leaf certificate ultimately chains to a Symantec root, it has been issued from an independently-operated subordinate CA that has been excluded from early expiration.

Certificate Chain

Leaf certificate
*.mailbox.org | 1cb1573
Not After: 09 Jun 2023 23:59:59 UTC (expires in 9 months 24 days)
Authentication: RSA 4096 bits (SHA256withRSA)
 View details
Intermediate certificate
Thawte TLS RSA CA G1 | 4bcc5e2
Not After: 02 Nov 2027 12:24:25 UTC (expires in 5 years 2 months)
Authentication: RSA 2048 bits (SHA256withRSA)
 View details
Root certificate
DigiCert Global Root G2 | cb3ccbb
Not After: 15 Jan 2038 12:00:00 UTC (expires in 15 years 4 months)
Authentication: RSA 2048 bits (SHA256withRSA)
 View details

Analysis

Good
Certificate chain is correct
Good. This chain contains all the right certificates and in the right order.

SMTP TLS Reporting

SMTP TLS Reporting (RFC 8460), or TLS-RPT for short, describes a reporting mechanism and format by which systems sending email can share statistics and specific information about potential failures with recipient domains. Recipient domains can then use this information to both detect potential attacks and diagnose unintentional misconfigurations. TLS-RPT can be used with DANE or MTA-STS.

Test passed
Everything seems to be well configured. Well done.

TLS-RPT Policy

Location from which we retrieved the policy indicator.Location _smtp._tls.mailbox.org
TLS-RPT standard version used by this policy indicator.Version TLSRPTv1
Reporting endpoints specified in the policy.Reporting Endpoints mailto:p.heinlein@heinlein-support.de

Analysis

Good
SMTP TLS-RPT policy valid
Good. Your TLS-RPT policy is valid. SMTP TLS Reporting is a young standard that is not yet widely supported, but support is probably going to increase over time.

HTTP (80)

To observe your HTTP implementation, we submit a request to the homepage of your site on port 80, follow all redirections (even when they take us to other domain names), and record the returned HTTP headers.

Test passed
Everything seems to be well configured. Well done.

URL: http://mailbox.org/

1
http://mailbox.org/
HTTP/1.1 302 Found
2
https://mailbox.org/
HTTP/1.1 302 Found
3
https://mailbox.org/en/
HTTP/1.1 200 OK

Analysis

Good
HTTP redirects to HTTPS
Good. This plaintext HTTP server redirects to HTTPS.

URL: http://www.mailbox.org/

1
http://www.mailbox.org/
HTTP/1.1 302 Found
2
https://mailbox.org/
HTTP/1.1 302 Found
3
https://mailbox.org/en/
HTTP/1.1 200 OK

Analysis

Good
HTTP redirects to HTTPS
Good. This plaintext HTTP server redirects to HTTPS.

HTTP (443)

To observe your HTTPS implementation, we submit a request to the homepage of your site on port 443, follow all redirections (even when they take us to other domain names), and record the returned HTTP headers. We use the most recent set of headers returned from the tested hostname for further tests such as HSTS and HPKP.

Test passed
Everything seems to be well configured. Well done.

URL: https://mailbox.org/

1
https://mailbox.org/
HTTP/1.1 302 Found
2
https://mailbox.org/en/
HTTP/1.1 200 OK

URL: https://www.mailbox.org/

1
https://www.mailbox.org/
HTTP/1.1 302 Found
2
https://mailbox.org/
HTTP/1.1 302 Found
3
https://mailbox.org/en/
HTTP/1.1 200 OK

WWW TLS

Transport Layer Security (TLS) is the most widely used encryption protocol on the Internet. In combination with valid certificates, servers can establish trusted communication channels even with users who have never visited them before. Network attackers can't uncover what is being communicated, even when they can see all the traffic.

Test passed, but there are warnings
Some aspect of your site's configuration require your attention.

TLS Configuration: www.mailbox.org (2001:67c:2050:106:0:0:443:194)

Encryption protocol version determines what features are
available for negotiation between client and server.
Supported protocols
TLS v1.3
Servers should always enforce their own cipher
suite preference, as that is the only approach
that guarantees that the best possible suite is
selected.
Server suite preference
Unknown
Shows cipher suite configuration for this protocol version.TLS v1.3
Unknown preference
Suite: TLS_AES_256_GCM_SHA384
Suite ID: 0x1302
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ecdh_x25519
Key exchange strength: EC ecdh_x25519 (256 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_AES_256_GCM_SHA384
 256 bits (ECDHE 256 bits)
Suite: TLS_CHACHA20_POLY1305_SHA256
Suite ID: 0x1303
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: ecdh_x25519
Key exchange strength: EC ecdh_x25519 (256 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 256 bits)
Suite: TLS_AES_128_GCM_SHA256
Suite ID: 0x1301
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ecdh_x25519
Key exchange strength: EC ecdh_x25519 (256 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_AES_128_GCM_SHA256
 128 bits (ECDHE 256 bits)

Analysis

Good
TLS 1.3 supported
Excellent. This server supports TLS 1.3, which is the latest revision of the TLS protocol and a significant improvement over earlier versions. Developed over a period of several years and extensively analyzed prior to the release, TLS 1.3 removed insecure features, and improved both security and performance.
Warning
TLS 1.2 not supported
This server doesn't support TLS 1.2, which may be necessary to support a wide range of clients, including the ones that don't yet support TLS 1.3. If you're receiving reports of connection problems to your web site, this could be the root cause.
Good
Deprecated protocols not supported
Excellent. This server doesn't support any of the deprecated protocol (TLS 1.1 and earlier).
Good
All TLS connections with this server satisfy Apple's CT requirements
All TLS connections established with this server satisfy Chrome's CT requirements, using certificate, TLS extension, or OCSP response as SCT transport method.
Notice
Server is not compliant with Chrome's CT requirements
Not all TLS connections with this server satisfy Chrome's CT requirements even. This is not necessarily a problem, as CT compliance is only required for certificates issued from May 2018.
Notice
DHE suites not supported
This server doesn't support the Diffie-Hellman (DH) key exchange.

TLS Configuration: www.mailbox.org (80.241.60.194)

Encryption protocol version determines what features are
available for negotiation between client and server.
Supported protocols
TLS v1.3
Servers should always enforce their own cipher
suite preference, as that is the only approach
that guarantees that the best possible suite is
selected.
Server suite preference
Unknown
Shows cipher suite configuration for this protocol version.TLS v1.3
Unknown preference
Suite: TLS_AES_256_GCM_SHA384
Suite ID: 0x1302
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ecdh_x25519
Key exchange strength: EC ecdh_x25519 (256 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_AES_256_GCM_SHA384
 256 bits (ECDHE 256 bits)
Suite: TLS_CHACHA20_POLY1305_SHA256
Suite ID: 0x1303
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: ecdh_x25519
Key exchange strength: EC ecdh_x25519 (256 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 256 bits)
Suite: TLS_AES_128_GCM_SHA256
Suite ID: 0x1301
Cipher name: AES
Cipher strength: 128 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ecdh_x25519
Key exchange strength: EC ecdh_x25519 (256 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_AES_128_GCM_SHA256
 128 bits (ECDHE 256 bits)

Analysis

Good
TLS 1.3 supported
Excellent. This server supports TLS 1.3, which is the latest revision of the TLS protocol and a significant improvement over earlier versions. Developed over a period of several years and extensively analyzed prior to the release, TLS 1.3 removed insecure features, and improved both security and performance.
Warning
TLS 1.2 not supported
This server doesn't support TLS 1.2, which may be necessary to support a wide range of clients, including the ones that don't yet support TLS 1.3. If you're receiving reports of connection problems to your web site, this could be the root cause.
Good
Deprecated protocols not supported
Excellent. This server doesn't support any of the deprecated protocol (TLS 1.1 and earlier).
Good
All TLS connections with this server satisfy Apple's CT requirements
All TLS connections established with this server satisfy Chrome's CT requirements, using certificate, TLS extension, or OCSP response as SCT transport method.
Notice
Server is not compliant with Chrome's CT requirements
Not all TLS connections with this server satisfy Chrome's CT requirements even. This is not necessarily a problem, as CT compliance is only required for certificates issued from May 2018.
Notice
DHE suites not supported
This server doesn't support the Diffie-Hellman (DH) key exchange.

TLS Configuration: mailbox.org (2001:67c:2050:106:0:0:443:194)

Encryption protocol version determines what features are
available for negotiation between client and server.
Supported protocols
TLS v1.3
TLS v1.2
Servers should always enforce their own cipher
suite preference, as that is the only approach
that guarantees that the best possible suite is
selected.
Server suite preference
Shows cipher suite configuration for this protocol version.TLS v1.3
Server preference
Suite: TLS_CHACHA20_POLY1305_SHA256
Suite ID: 0x1303
Cipher name: CHACHA20
Cipher strength: 256 bits
Cipher mode: AEAD
Key exchange: ecdh_x25519
Key exchange strength: EC ecdh_x25519 (256 bits)
Forward secrecy: Yes
PRF: SHA256
TLS_CHACHA20_POLY1305_SHA256
 256 bits (ECDHE 256 bits)
Suite: TLS_AES_256_GCM_SHA384
Suite ID: 0x1302
Cipher name: AES
Cipher strength: 256 bits
Cipher block size: 128 bits
Cipher mode: AEAD
Key exchange: ecdh_x25519
Key exchange strength: EC ecdh_x25519 (256 bits)
Forward secrecy: Yes
PRF: SHA384
TLS_AES_256_GCM_SHA384
 256 bits (ECDHE 256 bits)
Shows cipher suite configuration for this protocol version.TLS v1.2
Server preference