SSL-Tools

SSL check results of cdn21.de

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Discover if the mail servers for cdn21.de 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

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Report created Wed, 17 Apr 2024 20:12:02 +0000

The mailservers of cdn21.de can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @cdn21.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mail2.valicek.de
159.69.183.76
 10
supported
mail2.valicek.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
36 s

Outgoing Mails

We have not received any emails from a @cdn21.de address so far. Test mail delivery

Certificates

First seen at:

CN=mail2.valicek.de

Certificate chain
  • mail2.valicek.de
    • remaining
    • 256 bit
    • sha256WithRSAEncryption
      • R3
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • mail2.valicek.de
Alternative Names
  • jmap.cdn21.de
  • mail.cdn21.de
  • mail2.valicek.de
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R3
validity period
Not valid before
2024-04-17
Not valid after
2024-07-16
This certifcate has been verified for the following usages:
  • Digital Signature
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
F6:62:20:AF:9D:9A:CE:C0:3B:08:CF:C0:76:94:6C:3E:16:DE:98:EB:82:F4:A4:46:B1:4F:CD:4C:73:1D:A7:EE
SHA1
F5:27:19:3D:A1:82:14:BE:8B:BF:A0:AD:72:89:53:5B:AF:A3:3D:25
X509v3 extensions
subjectKeyIdentifier
  • EE:5E:6F:CD:78:13:57:F5:35:0F:90:F6:5A:4A:39:3C:FC:CB:88:30
authorityKeyIdentifier
  • keyid:14:2E:B3:17:B7:58:56:CB:AE:50:09:40:E6:1F:AF:9D:8B:14:C2:C6
authorityInfoAccess
  • OCSP - URI:http://r3.o.lencr.org
  • CA Issuers - URI:http://r3.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 3B:53:77:75:3E:2D:B9:80:4E:8B:30:5B:06:FE:40:3B:
  • 67:D8:4F:C3:F4:C7:BD:00:0D:2D:72:6F:E1:FA:D4:17
  • Timestamp : Apr 17 19:38:24.487 2024 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:6B:A9:3C:BC:3F:EA:25:84:9C:B6:60:A9:
  • CF:F3:60:8F:99:16:4B:C8:07:B5:C2:51:8D:DD:2B:F8:
  • 0A:EF:9E:A7:02:21:00:FF:28:1C:E7:D9:A1:5D:8C:7A:
  • 3A:0C:F8:EF:26:5C:F9:59:10:A2:FC:28:5F:B2:65:31:
  • A4:D7:18:CE:01:CA:34
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 76:FF:88:3F:0A:B6:FB:95:51:C2:61:CC:F5:87:BA:34:
  • B4:A4:CD:BB:29:DC:68:42:0A:9F:E6:67:4C:5A:3A:74
  • Timestamp : Apr 17 19:38:24.554 2024 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:22:B6:CA:7F:32:F7:29:A6:BD:81:0B:14:
  • D8:FB:FE:EC:8A:71:34:30:CF:DA:26:5F:1A:0B:50:ED:
  • 40:66:93:85:02:21:00:DB:D8:D4:D0:40:02:E7:B8:8C:
  • 6D:39:89:14:FD:46:D0:B0:EB:E9:24:FB:C6:8D:34:FA:
  • 16:91:E3:24:85:7E:97