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SSL check results of cfrq.net

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Discover if the mail servers for cfrq.net can be reached through a secure connection.

To establish a secure connection a mail server has to offer STARTTLS (SSL), a trustworthy SSL certificate, support for the Diffie-Hellman-Algorithm to guarantee Perfect Forward Secrecy and must not be vulnerable against the Heartbleed attack. Futhermore we recommend using end-to-end encryption with GnuPG.

Summary

JSON Refresh

Report created Mon, 30 Mar 2026 21:15:57 +0000

The mailservers of cfrq.net can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @cfrq.net addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
persephone.cfrq.net
2a01:7e01::f03c:91ff:fed5:f474
 10
supported
persephone.cfrq.net
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
7 s
persephone.cfrq.net
172.104.150.145
 10
supported
persephone.cfrq.net
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
8 s
penelope.cfrq.net
2600:3c03::f03c:91ff:fe70:f23e
Results incomplete
20 not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
penelope.cfrq.net
173.255.229.79
 20
supported
penelope.cfrq.net
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
11 s

Outgoing Mails

We have not received any emails from a @cfrq.net address so far. Test mail delivery

Certificates

First seen at:

CN=persephone.cfrq.net

Certificate chain
  • persephone.cfrq.net
    • remaining
    • 2048 bit
    • sha256WithRSAEncryption
      • R12
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • persephone.cfrq.net
Alternative Names
  • lists.cfrq.net
  • mail.cfrq.net
  • mail.kochhaus.net
  • mail.the-gang.ca
  • persephone.cfrq.net
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R12
validity period
Not valid before
2026-03-01
Not valid after
2026-05-30
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
Fingerprints
SHA256
30:DE:81:55:F5:42:48:51:96:3E:2E:E4:D3:43:B0:16:9E:AE:FC:98:53:7B:22:87:DE:B6:6A:B6:A2:84:85:89
SHA1
51:50:43:50:DA:EF:72:60:39:46:B9:3B:6D:A9:45:02:86:38:B4:97
X509v3 extensions
subjectKeyIdentifier
  • 0D:41:4F:57:76:85:B2:24:42:EB:15:52:30:14:D1:EC:AA:ED:8C:DC
authorityKeyIdentifier
  • keyid:00:B5:29:F2:2D:8E:6F:31:E8:9B:4C:AD:78:3E:FA:DC:E9:0C:D1:D2
authorityInfoAccess
  • CA Issuers - URI:http://r12.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r12.c.lencr.org/77.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 0E:57:94:BC:F3:AE:A9:3E:33:1B:2C:99:07:B3:F7:90:
  • DF:9B:C2:3D:71:32:25:DD:21:A9:25:AC:61:C5:4E:21
  • Timestamp : Mar 1 06:23:18.887 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:4B:3A:5B:A6:78:5F:DC:90:DD:B2:06:B3:
  • 38:18:36:C4:1F:F2:71:05:C4:90:94:6B:B1:5F:1E:F4:
  • EA:92:2C:55:02:20:02:12:FF:18:7C:B9:51:6B:7F:45:
  • 32:A0:44:1A:68:6B:8A:5A:30:F2:50:FD:A2:54:73:ED:
  • 91:C8:D7:EC:C3:0E
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : D1:6E:A9:A5:68:07:7E:66:35:A0:3F:37:A5:DD:BC:03:
  • A5:3C:41:12:14:D4:88:18:F5:E9:31:B3:23:CB:95:04
  • Timestamp : Mar 1 06:23:19.127 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:B9:EF:B0:CE:63:8F:D8:50:A4:6E:30:
  • F2:CB:98:45:9F:1C:38:96:6F:E8:09:02:AE:36:03:33:
  • 1C:E3:AA:28:DD:02:21:00:9F:93:E4:99:76:3A:09:54:
  • 85:71:BF:AB:4B:A5:E9:FE:F9:FD:6C:D0:3F:DD:74:BB:
  • FE:0A:E4:3A:32:89:50:0D
First seen at:

CN=penelope.cfrq.net

Certificate chain
  • penelope.cfrq.net
    • remaining
    • 2048 bit
    • sha256WithRSAEncryption
      • R13
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • penelope.cfrq.net
Alternative Names
  • penelope.cfrq.net
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R13
validity period
Not valid before
2026-03-08
Not valid after
2026-06-06
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
Fingerprints
SHA256
A6:7C:93:34:64:A7:4A:CA:B9:0C:56:6D:72:D4:CC:41:92:5C:36:FB:EF:E6:98:02:D0:D1:2A:D0:2F:46:FC:BE
SHA1
DC:54:34:8B:BB:CC:CC:C9:AF:FB:3F:A2:7C:AA:5E:29:93:84:ED:D7
X509v3 extensions
subjectKeyIdentifier
  • A6:F0:98:89:E9:1A:78:77:A5:84:7C:84:FB:0A:3E:1A:B9:30:8F:D1
authorityKeyIdentifier
  • keyid:E7:AB:9F:0F:2C:33:A0:53:D3:5E:4F:78:C8:B2:84:0E:3B:D6:92:33
authorityInfoAccess
  • CA Issuers - URI:http://r13.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r13.c.lencr.org/62.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 16:83:2D:AB:F0:A9:25:0F:0F:F0:3A:A5:45:FF:C8:BF:
  • C8:23:D0:87:4B:F6:04:29:27:F8:E7:1F:33:13:F5:FA
  • Timestamp : Mar 8 06:07:03.324 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:A0:00:8C:24:52:78:15:F0:CD:F7:EA:
  • 4B:76:8E:59:FD:1A:79:0D:BD:7B:3F:44:4D:62:BC:84:
  • 8F:46:44:CC:EE:02:21:00:D7:CA:88:6C:80:95:EB:35:
  • 17:44:05:33:B5:93:C4:4F:23:F0:EE:84:4C:D5:EE:98:
  • 11:9C:79:D2:83:1A:C8:EB
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 96:97:64:BF:55:58:97:AD:F7:43:87:68:37:08:42:77:
  • E9:F0:3A:D5:F6:A4:F3:36:6E:46:A4:3F:0F:CA:A9:C6
  • Timestamp : Mar 8 06:07:03.364 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:48:DA:2E:AD:9E:1A:9B:53:DE:82:87:67:
  • D4:5E:9B:69:DC:A4:02:CA:24:14:C9:56:45:7B:45:9A:
  • A0:3C:14:D6:02:20:32:52:2A:6C:DF:F5:74:C9:DE:AD:
  • D6:B5:50:21:F2:D0:CC:21:C4:1A:7A:B5:69:14:57:AC:
  • 54:CA:03:EE:75:B7