SSL check results of kessler-server.de

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Discover if the mail servers for kessler-server.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

Report created Sun, 13 Oct 2019 19:58:38 +0000

The mailservers of kessler-server.de can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @kessler-server.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
kessler-server.de
185.228.138.44
0
supported
kessler-server.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
1 s

Outgoing Mails

We have received emails from these servers with @kessler-server.de sender addresses. Test mail delivery

Host TLS Version & Cipher
kessler-server.de (185.228.138.44)
TLSv1.2 ADH-AES256-GCM-SHA384

Certificates

First seen at:

CN=kessler-server.de

Certificate chain
Subject
Common Name (CN)
  • kessler-server.de
Alternative Names
  • imap.kessler-server.de
  • kessler-server.de
  • smtp.kessler-server.de
  • webmail.kessler-server.de
  • www.kessler-server.de
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • Let's Encrypt Authority X3
validity period
Not valid before
2019-10-12
Not valid after
2020-01-10
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
4F:15:64:19:F2:B7:75:C5:C4:F9:AA:A9:DD:0E:3C:29:6C:9F:B6:F0:CF:B2:30:D0:B6:A7:93:6C:3F:33:A2:1B
SHA1
86:58:D9:81:EB:6F:25:0D:22:12:C3:B3:13:00:5E:50:D3:7E:5B:0A
X509v3 extensions
subjectKeyIdentifier
  • CB:A4:69:5A:41:B1:65:36:20:8B:CB:2D:6F:6D:5F:52:6F:BA:34:76
authorityKeyIdentifier
  • keyid:A8:4A:6A:63:04:7D:DD:BA:E6:D1:39:B7:A6:45:65:EF:F3:A8:EC:A1
authorityInfoAccess
  • OCSP - URI:http://ocsp.int-x3.letsencrypt.org
  • CA Issuers - URI:http://cert.int-x3.letsencrypt.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
  • Policy: 1.3.6.1.4.1.44947.1.1.1
  • CPS: http://cps.letsencrypt.org
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 5E:A7:73:F9:DF:56:C0:E7:B5:36:48:7D:D0:49:E0:32:
  • 7A:91:9A:0C:84:A1:12:12:84:18:75:96:81:71:45:58
  • Timestamp : Oct 12 10:31:11.641 2019 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:28:74:67:8E:EC:D1:D6:6C:4C:93:B6:C3:
  • B1:64:E8:9B:2C:3E:E9:BF:73:47:B0:BB:71:10:4A:3A:
  • F8:FD:CD:DB:02:21:00:F3:D2:FD:AA:35:1F:27:76:8B:
  • 82:76:9E:14:FC:50:91:30:32:A6:6A:82:D9:52:F3:E0:
  • 7B:FF:F4:BF:B9:C2:47
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 29:3C:51:96:54:C8:39:65:BA:AA:50:FC:58:07:D4:B7:
  • 6F:BF:58:7A:29:72:DC:A4:C3:0C:F4:E5:45:47:F4:78
  • Timestamp : Oct 12 10:31:11.642 2019 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:1E:02:E1:E8:71:3F:63:EC:B8:BF:6B:53:
  • BD:7A:95:78:74:20:A1:5C:C1:43:47:16:4C:7B:BF:63:
  • E4:2C:92:07:02:21:00:A1:3C:56:95:CF:67:7A:57:32:
  • 4C:33:0F:73:54:90:40:64:E9:3E:18:86:38:8B:C0:56:
  • 62:47:B4:08:46:20:B3