SSL-Tools

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

JSON Refresh

Report created Mon, 25 May 2020 11:02:25 +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
webmail.kessler-server.de
188.138.10.132
 100
supported
webmail.kessler-server.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
8 s

Outgoing Mails

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

Certificates

First seen at:

CN=webmail.kessler-server.de

Certificate chain
Subject
Common Name (CN)
  • webmail.kessler-server.de
Alternative Names
  • webmail.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
2020-04-09
Not valid after
2020-07-08
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
61:48:91:54:46:54:3F:BE:4C:E6:9E:8F:C2:99:36:0A:D7:FA:7C:5B:62:4F:9C:69:3F:0B:24:C8:B2:03:35:48
SHA1
2A:C7:66:51:23:F3:EC:42:E7:9D:EE:E8:DF:AB:23:A6:53:ED:80:01
X509v3 extensions
subjectKeyIdentifier
  • 3D:C0:8C:D2:82:02:95:52:DC:C2:A1:D0:3B:32:23:FE:95:22:AB:96
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 : B2:1E:05:CC:8B:A2:CD:8A:20:4E:87:66:F9:2B:B9:8A:
  • 25:20:67:6B:DA:FA:70:E7:B2:49:53:2D:EF:8B:90:5E
  • Timestamp : Apr 9 23:29:42.167 2020 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:6D:1E:11:63:A9:6E:BC:E3:14:AF:2A:C2:
  • E2:94:34:81:CD:E1:DA:87:FB:9E:14:4A:12:3D:DA:F9:
  • 36:21:88:95:02:20:6C:1C:AF:1A:AD:0C:DD:F0:19:9A:
  • 05:7A:C2:24:51:D1:AF:60:00:D4:90:78:CF:25:45:40:
  • EA:54:EE:72:BB:73
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 6F:53:76:AC:31:F0:31:19:D8:99:00:A4:51:15:FF:77:
  • 15:1C:11:D9:02:C1:00:29:06:8D:B2:08:9A:37:D9:13
  • Timestamp : Apr 9 23:29:42.223 2020 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:15:EC:0E:B8:B0:6E:89:8F:79:9C:28:AD:
  • E1:B8:06:F3:3F:54:0C:B9:25:40:CB:F8:DF:09:A6:A9:
  • 73:CE:B3:C7:02:21:00:AE:67:64:6D:7D:C5:4D:F7:C3:
  • 29:4B:E0:C1:DB:FF:6A:C2:A4:58:64:2D:09:1C:1E:C3:
  • F1:F2:31:E6:50:6E:B4