SSL-Tools

SSL check results of smtp.kemmler-gmbh.de

NEW You can also bulk check multiple servers.

Discover if the mail servers for smtp.kemmler-gmbh.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 Fri, 21 Aug 2026 00:30:23 +0000

We can not guarantee a secure connection to the mailservers of smtp.kemmler-gmbh.de!

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

/mailservers/smtp.kemmler-gmbh.de

Servers

Incoming Mails

These servers are responsible for incoming mails to @smtp.kemmler-gmbh.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
smtp.kemmler-gmbh.de
52.57.43.166
 -
supported
dresden.jweiland.cloud
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
smtp.kemmler-gmbh.de
2a05:d014:14f:aa1d:21c1:5045:1317:7f39
Results incomplete
- not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s

Outgoing Mails

We have not received any emails from a @smtp.kemmler-gmbh.de address so far. Test mail delivery

Certificates

First seen at:

CN=dresden.jweiland.cloud

Certificate chain
  • dresden.jweiland.cloud
    • remaining
    • 256 bit
    • ecdsa-with-SHA384
    • Hostname Mismatch
      • 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)
  • dresden.jweiland.cloud
Alternative Names
  • dresden.jweiland.cloud
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • YE1
validity period
Not valid before
2026-08-02
Not valid after
2026-10-31
This certifcate has been verified for the following usages:
  • Digital Signature
  • TLS Web Server Authentication
Fingerprints
SHA256
F9:E3:7D:90:22:D9:B2:A7:1B:5C:7C:67:DA:BC:86:DA:3E:85:95:9A:0B:63:C5:E8:29:93:F7:AF:18:C4:E6:58
SHA1
49:9B:B1:A5:D6:20:25:09:8E:D4:7B:1E:92:AB:D2:A0:08:30:6E:4A
X509v3 extensions
subjectKeyIdentifier
  • 72:A1:14:FA:47:29:12:15:A4:0A:E4:81:34:DA:F6:78:79:45:F0:57
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/104.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : C8:A3:C4:7F:C7:B3:AD:B9:35:6B:01:3F:6A:7A:12:6D:
  • E3:3A:4E:43:A5:C6:46:F9:97:AD:39:75:99:1D:CF:9A
  • Timestamp : Aug 2 14:04:15.524 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:09:6E:2A:AD:73:67:3F:70:BB:84:CC:2F:
  • 2E:55:48:D8:2C:D4:55:4A:72:03:47:92:00:0D:97:8A:
  • 36:BE:82:73:02:20:15:A8:A7:41:F4:5D:6A:2C:D0:63:
  • FC:97:35:9B:B1:00:FE:58:8C:56:75:4C:70:44:8D:71:
  • 06:49:FA:2C:54:13
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : A8:26:CB:E3:0A:C6:35:12:46:53:3F:E0:65:F1:4F:19:
  • D9:6E:19:08:13:C4:1D:D9:6D:79:00:B3:12:3C:55:27
  • Timestamp : Aug 2 14:04:16.029 2026 GMT
  • Extensions: 00:00:05:00:17:E4:3E:99
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:D0:E8:23:B5:6E:7E:A5:E7:9D:E5:A1:
  • 0A:46:82:6C:BF:98:8B:DF:2A:DE:F7:11:CC:9A:F6:67:
  • 8A:A0:18:32:E9:02:20:4E:0C:E2:DE:33:42:4D:FF:42:
  • 6E:1A:23:E2:62:D0:1A:56:2E:3B:F9:16:92:D3:F1:AD:
  • 9A:C6:B1:77:67:F4:9B