SSL-Tools

SSL check results of gkm.de

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Discover if the mail servers for gkm.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 Tue, 23 Jun 2026 07:49:18 +0000

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

Servers

Incoming Mails

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

Hostname / IP address Priority STARTTLS Certificates Protocol
mail1.gkm.de
193.16.140.51
 10
supported
mail1.gkm.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
mail2.gkm.de
193.16.140.53
 20
supported
mail2.gkm.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s

Outgoing Mails

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

Host TLS Version & Cipher
mail1.gkm.de (193.16.140.51)
TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384

Certificates

First seen at:

CN=mail1.gkm.de

Certificate chain
Subject
Common Name (CN)
  • mail1.gkm.de
Alternative Names
  • mail1.gkm.de
Issuer
Country (C)
  • US
Organization (O)
  • DigiCert Inc
Organizational Unit (OU)
  • www.digicert.com
Common Name (CN)
  • RapidSSL TLS RSA CA G1
validity period
Not valid before
2026-06-22
Not valid after
2027-01-06
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
89:85:BA:00:14:71:D6:29:8D:81:7A:A7:35:EF:0A:96:A2:01:04:C5:7D:A0:38:B1:C6:06:21:87:DB:D7:E2:EE
SHA1
8F:07:32:D5:D1:5C:63:69:04:63:7C:9C:4D:24:90:F2:71:64:1B:27
X509v3 extensions
authorityKeyIdentifier
  • keyid:0C:DB:6C:82:49:0F:4A:67:0A:B8:14:EE:7A:C4:48:52:88:EB:56:38
subjectKeyIdentifier
  • A1:E1:9E:34:21:2F:E6:F6:9D:B1:12:44:2A:68:82:6B:19:4F:5B:4C
certificatePolicies
  • Policy: 2.23.140.1.2.1
  • CPS: http://www.digicert.com/CPS
crlDistributionPoints
  • Full Name:
  • URI:http://cdp.rapidssl.com/RapidSSLTLSRSACAG1.crl
authorityInfoAccess
  • OCSP - URI:http://status.rapidssl.com
  • CA Issuers - URI:http://cacerts.rapidssl.com/RapidSSLTLSRSACAG1.crt
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F:
  • AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26
  • Timestamp : Jun 22 06:11:30.551 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:FF:D7:4D:7F:37:2C:53:AE:F5:18:02:
  • 38:96:4B:27:83:69:99:B5:FA:DD:D3:ED:C2:E9:52:77:
  • 73:F5:2B:BF:05:02:20:23:2A:38:96:96:4B:CB:FA:79:
  • 96:CF:EE:65:6F:07:80:21:7F:25:F8:74:02:0D:FF:80:
  • C2:FA:55:22:E1:DD:52
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF:
  • EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02
  • Timestamp : Jun 22 06:11:30.543 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:37:40:B8:53:9F:E1:03:77:D6:A0:6A:E4:
  • 9C:FB:2B:F5:7B:94:07:32:F6:61:7A:E5:B5:96:67:D2:
  • 60:18:6D:B9:02:21:00:8E:CE:A8:7C:7C:5C:84:C6:CD:
  • 36:F2:11:45:0B:48:8A:4F:91:60:D3:DD:94:54:1A:47:
  • AF:A0:8D:23:05:86:23
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 44:C2:BD:0C:E9:14:0E:64:A5:C9:4A:01:93:0A:5A:A1:
  • BB:35:97:0E:00:EE:11:16:89:68:2A:1C:44:D7:B5:66
  • Timestamp : Jun 22 06:11:30.633 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:02:6B:9B:BA:00:CD:2C:CE:A7:7E:64:0C:
  • 0F:07:F7:F2:CF:CD:18:8D:31:D0:40:BF:91:4B:23:AD:
  • C4:BE:E6:04:02:20:54:CE:3C:43:54:43:0D:DD:76:32:
  • 0F:27:4C:1F:51:F8:37:9C:0B:91:1D:46:53:73:30:AC:
  • 78:9D:9B:90:A3:C3
First seen at:

CN=mail2.gkm.de

Certificate chain
Subject
Common Name (CN)
  • mail2.gkm.de
Alternative Names
  • mail2.gkm.de
Issuer
Country (C)
  • US
Organization (O)
  • DigiCert Inc
Organizational Unit (OU)
  • www.digicert.com
Common Name (CN)
  • RapidSSL TLS RSA CA G1
validity period
Not valid before
2026-06-23
Not valid after
2027-01-07
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
18:18:7A:87:95:42:DC:DC:78:7F:E1:7F:9F:C8:E5:EE:94:69:17:B1:E6:48:16:2C:99:B9:D4:40:75:D3:BA:52
SHA1
E8:33:05:01:70:0B:92:BD:65:00:BE:80:60:20:1C:6C:44:9B:C0:17
X509v3 extensions
authorityKeyIdentifier
  • keyid:0C:DB:6C:82:49:0F:4A:67:0A:B8:14:EE:7A:C4:48:52:88:EB:56:38
subjectKeyIdentifier
  • 41:FE:30:15:F8:55:9B:C2:B7:72:2F:F1:EB:E1:FB:56:B7:DE:A1:77
certificatePolicies
  • Policy: 2.23.140.1.2.1
  • CPS: http://www.digicert.com/CPS
crlDistributionPoints
  • Full Name:
  • URI:http://cdp.rapidssl.com/RapidSSLTLSRSACAG1.crl
authorityInfoAccess
  • OCSP - URI:http://status.rapidssl.com
  • CA Issuers - URI:http://cacerts.rapidssl.com/RapidSSLTLSRSACAG1.crt
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F:
  • AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26
  • Timestamp : Jun 23 07:32:10.727 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:5F:EE:53:B5:91:41:73:A2:95:A4:47:E4:
  • BD:76:F8:52:17:E1:04:DD:79:85:A3:7A:7A:BE:86:D2:
  • 72:C1:DC:02:02:21:00:DD:38:11:F7:DE:D4:5D:87:CA:
  • A9:87:50:67:F2:10:0A:9D:24:61:14:4B:51:9F:FC:6E:
  • 43:54:61:2F:35:74:A0
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF:
  • EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02
  • Timestamp : Jun 23 07:32:10.773 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:C5:44:66:D5:4C:04:6F:0D:93:75:78:
  • 13:BC:8C:D8:E6:A4:69:B7:12:D6:18:24:3C:E7:03:D9:
  • AA:DC:98:0E:EE:02:21:00:C6:5B:E9:DE:7E:83:2D:06:
  • 3C:C7:6E:33:AF:A7:84:FF:23:A6:58:A5:5E:0B:68:CF:
  • 32:B1:F2:FA:5C:C6:05:D2
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD:
  • DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F
  • Timestamp : Jun 23 07:32:10.941 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:25:D2:F6:6B:22:5A:78:5C:2D:FE:9A:C3:
  • 11:25:C4:B9:8F:E4:95:3C:4B:31:5E:89:63:9C:F5:EB:
  • F9:B9:4A:2E:02:21:00:EB:8A:30:82:2C:FC:07:C1:2B:
  • 02:12:77:97:22:CE:76:F1:8D:DB:7A:0D:F8:69:DA:55:
  • 98:A3:CF:47:B7:32:5A