SSL-Tools

SSL check results of drgueldener.de

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Discover if the mail servers for drgueldener.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 Wed, 02 Sep 2026 15:08:52 +0000

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

Servers

Incoming Mails

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

Hostname / IP address Priority STARTTLS Certificates Protocol
mx3.drgueldener.de
57.133.151.60
 11
supported
drgueldener.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
8 s
mx4.drgueldener.de
57.133.151.59
 12
supported
drgueldener.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s

Outgoing Mails

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

Certificates

First seen at:

CN=drgueldener.de,O=Optica Abrechnungszentrum Dr. Güldener GmbH,L=Stuttgart,ST=Baden-Württemberg,C=DE

Certificate chain
Subject
Country (C)
  • DE
State (ST)
  • Baden-Württemberg
Locality (L)
  • Stuttgart
Organization (O)
  • Optica Abrechnungszentrum Dr. Güldener GmbH
Common Name (CN)
  • drgueldener.de
Alternative Names
  • drgueldener.de
  • mx3.drgueldener.de
  • mx4.drgueldener.de
  • mx1.drgueldener.de
  • mx2.drgueldener.de
Issuer
Country (C)
  • US
Organization (O)
  • DigiCert Inc
Organizational Unit (OU)
  • www.digicert.com
Common Name (CN)
  • GeoTrust TLS RSA CA G1
validity period
Not valid before
2026-08-25
Not valid after
2027-03-11
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
A2:1E:B4:16:92:5B:71:9E:82:88:78:6B:0B:6C:F3:40:BE:5F:A0:2D:92:31:64:95:A6:1A:F5:0D:44:8B:EC:82
SHA1
93:63:CA:45:BF:4A:2C:36:B3:91:67:6E:1C:B4:AE:CA:11:4A:AB:F6
X509v3 extensions
authorityKeyIdentifier
  • keyid:94:4F:D4:5D:8B:E4:A4:E2:A6:80:FE:FD:D8:F9:00:EF:A3:BE:02:57
subjectKeyIdentifier
  • 21:61:ED:41:BB:20:78:23:2D:DF:5A:FD:94:C4:68:28:48:9F:5F:5B
certificatePolicies
  • Policy: 2.23.140.1.2.2
  • CPS: http://www.digicert.com/CPS
crlDistributionPoints
  • Full Name:
  • URI:http://cdp.geotrust.com/GeoTrustTLSRSACAG1.crl
authorityInfoAccess
  • OCSP - URI:http://status.geotrust.com
  • CA Issuers - URI:http://cacerts.geotrust.com/GeoTrustTLSRSACAG1.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 : Aug 25 14:12:29.683 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:DC:DF:40:1F:96:44:48:D8:56:8C:34:
  • D7:09:54:5D:33:C5:12:A0:11:99:6E:3D:7C:ED:E5:2A:
  • EB:52:47:09:0B:02:20:4F:EA:AA:E2:90:1C:12:0B:ED:
  • 14:E3:C7:32:A3:C5:15:28:75:50:90:D1:26:D3:66:8A:
  • DB:95:71:E1:66:59:26
  • 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 : Aug 25 14:12:29.964 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:94:0A:8C:06:C5:9F:48:83:CE:A5:8A:
  • 72:0E:A4:17:E8:BE:22:29:8E:C9:18:55:A2:0E:C1:5F:
  • 20:82:AC:50:AF:02:20:2E:3A:98:7E:EB:82:CA:26:9C:
  • BA:5B:6C:32:39:1E:48:AE:98:C3:13:96:27:5B:E9:C7:
  • 4F:73:74:39:58:82:9A
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 8E:CA:47:0B:AC:DE:6A:F3:A2:06:B0:A4:7A:84:B7:46:
  • FE:1F:C6:BF:95:3E:25:E6:9B:4E:E4:02:48:F3:C6:E8
  • Timestamp : Aug 25 14:12:29.784 2026 GMT
  • Extensions: 00:00:05:00:0A:EB:DF:69
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:90:C5:42:FF:AC:10:6D:CC:9B:6E:77:
  • FD:EC:21:1F:8E:F1:DA:7C:40:A8:25:C0:EC:8D:7D:64:
  • 91:D0:32:91:7D:02:21:00:EC:E0:50:F7:DA:03:B8:43:
  • 33:AA:6E:34:2B:6F:8D:46:43:96:DE:EE:EF:EA:32:FA:
  • 6C:03:0B:9E:B7:4B:3C:16