SSL-Tools

SSL check results of htl2.de

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Discover if the mail servers for htl2.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 Thu, 09 Jul 2026 05:29:20 +0000

We can not guarantee a secure connection to the mailservers of htl2.de!

Please contact the operator of htl2.de and ask him or her to solve this problem. This result stays accessible under the following address:

/mailservers/htl2.de

Servers

Incoming Mails

These servers are responsible for incoming mails to @htl2.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mx.htl2.de
2a01:239:211:3800::1
Results incomplete
10 not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
mx.htl2.de
194.164.53.116
 10
supported
mx.htl2.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
9 s

Outgoing Mails

We have received emails from these servers with @htl2.de sender addresses. Test mail delivery

Host TLS Version & Cipher
v14905.1blu.de (178.254.8.105)
TLSv1.3 TLS_AES_256_GCM_SHA384

Certificates

First seen at:

CN=mx.htl2.de

Certificate chain
  • mx.htl2.de
    • remaining
    • 256 bit
    • ecdsa-with-SHA384
    • Unknown Authority
      E7
Subject
Common Name (CN)
  • mx.htl2.de
Alternative Names
  • mx.htl2.de
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • E7
validity period
Not valid before
2026-05-15
Not valid after
2026-08-13
This certifcate has been verified for the following usages:
  • Digital Signature
  • TLS Web Server Authentication
Fingerprints
SHA256
29:3E:C7:D9:DF:D7:CE:55:95:D9:13:61:42:17:11:AB:7A:45:D4:15:EC:CD:8C:F8:14:E3:B5:6F:2B:8E:EE:97
SHA1
30:C9:8A:EC:C2:99:98:20:43:45:F4:4E:B4:C9:64:AB:B8:4E:A8:DB
X509v3 extensions
subjectKeyIdentifier
  • 96:84:3A:59:25:F6:3A:BD:1E:91:12:A2:BC:05:7F:7B:4B:04:89:AF
authorityKeyIdentifier
  • keyid:AE:48:9E:DC:87:1D:44:A0:6F:DA:A2:E5:60:74:04:78:C2:9C:00:80
authorityInfoAccess
  • CA Issuers - URI:http://e7.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://e7.c.lencr.org/107.crl
ct_precert_scts
  • 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 : May 15 01:08:56.627 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:F3:56:E9:F4:04:D7:DF:F4:23:01:9C:
  • AD:41:33:8B:6D:3C:AA:ED:BA:C4:16:12:B0:0E:B5:8E:
  • 13:D4:8F:DA:65:02:20:7F:87:F3:99:B6:B8:BE:9A:F8:
  • 93:44:26:63:4D:20:0A:09:82:7A:39:D3:D8:87:BF:64:
  • 1B:86:27:68:E5:ED:94
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 1A:8B:9D:6B:0F:FE:BF:81:B4:79:39:C6:D2:31:0A:86:
  • D6:D1:02:D4:F0:46:E2:18:2C:9D:E3:5F:5E:26:25:EF
  • Timestamp : May 15 01:08:56.700 2026 GMT
  • Extensions: 00:00:05:00:12:D8:4B:32
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:7F:DB:92:BE:3A:3C:84:09:51:26:CE:72:
  • 36:52:6D:92:1B:C5:21:CE:3C:43:62:66:7C:21:74:12:
  • D5:A3:79:4E:02:21:00:86:F3:6F:9B:51:35:C3:E3:3F:
  • 5E:33:D4:10:D4:9C:33:88:86:56:78:E1:1A:CB:C2:52:
  • 4D:BE:80:97:9E:38:45