SSL-Tools

SSL check results of redtank.de

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Discover if the mail servers for redtank.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 Mon, 14 Sep 2026 05:52:33 +0000

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

Servers

Incoming Mails

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

Hostname / IP address Priority STARTTLS Certificates Protocol
mail.redtank.de
152.53.1.153
 10
supported
*.redtank.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s

Outgoing Mails

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

Certificates

First seen at:

CN=*.redtank.de

Certificate chain
  • *.redtank.de
    • remaining
    • 256 bit
    • ecdsa-with-SHA384
      • YE1
        • remaining
        • 384 bit
        • ecdsa-with-SHA384
          • Root YE
            • remaining
            • 384 bit
            • ecdsa-with-SHA384
              • ISRG Root X2 (Certificate is self-signed.)
                • remaining
                • 384 bit
                • ecdsa-with-SHA384
Subject
Common Name (CN)
  • *.redtank.de
Alternative Names
  • *.redtank.de
  • redtank.de
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • YE1
validity period
Not valid before
2026-09-13
Not valid after
2026-12-12
This certifcate has been verified for the following usages:
  • Digital Signature
  • TLS Web Server Authentication
Fingerprints
SHA256
AA:8C:08:6F:23:D0:52:64:83:07:BB:DB:4C:70:9D:5B:39:48:D2:A1:BE:94:87:CB:3F:E6:81:1F:B9:36:80:8F
SHA1
B5:E9:79:05:3C:38:AC:08:DF:5D:90:CC:7E:58:B0:B6:0F:29:BB:5B
X509v3 extensions
subjectKeyIdentifier
  • 14:94:EE:FF:B7:52:C8:65:C4:F4:F0:70:D2:8F:19:28:C1:4E:29:59
authorityKeyIdentifier
  • keyid:BB:20:CA:47:0B:FE:D7:E5:9C:F9:8F:09:2A:A3:8C:37:45:B1:BC:D8
authorityInfoAccess
  • CA Issuers - URI:http://ye1.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://ye1.c.lencr.org/54.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 46:AF:86:3D:3B:3E:E5:9F:A5:77:DE:A8:24:5D:36:B0:
  • D9:ED:22:A2:23:F4:61:77:41:22:94:52:EE:95:50:5F
  • Timestamp : Sep 13 22:25:45.152 2026 GMT
  • Extensions: 00:00:05:00:2D:72:24:BD
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:1B:ED:F4:97:15:08:57:F8:E9:62:C8:E3:
  • 1D:77:D3:B8:36:12:05:32:07:D1:F1:79:77:07:65:A9:
  • 51:E0:09:AC:02:21:00:AE:D6:7A:02:50:FE:D1:09:A3:
  • 20:EA:47:8B:2B:7B:8C:C6:52:3E:A8:4E:84:57:6F:FC:
  • 28:D3:25:A2:F0:CB:10
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 94:4E:43:87:FA:EC:C1:EF:81:F3:19:24:26:A8:18:65:
  • 01:C7:D3:5F:38:02:01:3F:72:67:7D:55:37:2E:19:D8
  • Timestamp : Sep 13 22:25:46.951 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:1A:EF:84:A5:70:F3:47:C1:56:0A:EA:F4:
  • 9E:7A:B0:4C:1A:83:4F:1E:C5:2B:F2:66:FA:73:CC:77:
  • 25:F9:7F:27:02:20:3D:99:5D:F5:20:73:C4:0C:B3:D4:
  • D3:62:A8:2B:66:99:37:92:D4:DE:4D:21:0E:15:12:3B:
  • 29:0A:D4:A8:FE:B5