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SSL check results of rzfw01.holz-sinsel.de

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Discover if the mail servers for rzfw01.holz-sinsel.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

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Report created Mon, 16 Feb 2026 15:19:27 +0000

The mailservers of rzfw01.holz-sinsel.de can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @rzfw01.holz-sinsel.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
rzfw01.holz-sinsel.de
93.189.156.45
 -
supported
rzfw01.holz-sinsel.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
11 s

Outgoing Mails

We have not received any emails from a @rzfw01.holz-sinsel.de address so far. Test mail delivery

Certificates

First seen at:

CN=rzfw01.holz-sinsel.de

Certificate chain
  • rzfw01.holz-sinsel.de
    • remaining
    • 2048 bit
    • sha256WithRSAEncryption
      • R13
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • rzfw01.holz-sinsel.de
Alternative Names
  • rzfw01.holz-sinsel.de
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R13
validity period
Not valid before
2026-01-21
Not valid after
2026-04-21
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
08:93:50:D5:3D:94:D8:5E:96:09:25:64:B4:54:3F:DE:A9:8E:0F:3E:F5:57:74:86:14:97:54:4B:60:FC:11:1A
SHA1
F6:1E:4E:52:A2:5D:83:4F:31:DB:60:AF:22:CC:93:B3:1B:7F:BE:F2
X509v3 extensions
subjectKeyIdentifier
  • B4:88:20:46:2B:3B:7F:AD:AC:8A:92:3D:B2:2C:E0:19:22:3F:C4:03
authorityKeyIdentifier
  • keyid:E7:AB:9F:0F:2C:33:A0:53:D3:5E:4F:78:C8:B2:84:0E:3B:D6:92:33
authorityInfoAccess
  • CA Issuers - URI:http://r13.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r13.c.lencr.org/8.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 71:7E:95:F3:C2:38:8A:6D:B1:E3:84:49:3D:31:E1:5A:
  • A9:62:08:76:2D:42:00:E0:05:0C:D0:67:B5:A6:61:E2
  • Timestamp : Jan 21 01:38:28.808 2026 GMT
  • Extensions: 00:00:05:00:07:6F:93:A0
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:53:55:F4:F4:04:2A:33:2E:2D:D0:21:10:
  • D5:C9:86:F6:89:C8:30:3F:CA:AD:D9:90:32:87:B1:B0:
  • 92:E3:26:67:02:21:00:C9:46:6F:23:11:08:95:97:6B:
  • AB:0C:33:3D:EF:D1:8A:79:C9:A7:53:39:82:54:CE:58:
  • 88:26:A8:46:3E:88:C3
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : D1:6E:A9:A5:68:07:7E:66:35:A0:3F:37:A5:DD:BC:03:
  • A5:3C:41:12:14:D4:88:18:F5:E9:31:B3:23:CB:95:04
  • Timestamp : Jan 21 01:38:30.867 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:F2:FE:0B:FA:89:68:8E:CF:30:0E:85:
  • FC:7F:DE:C7:D4:41:3E:D3:FF:D4:E3:57:8F:D8:41:E9:
  • CD:D4:53:D2:FB:02:21:00:FC:B1:7B:0E:2B:0F:7E:75:
  • 3B:33:05:61:A9:74:7E:5B:24:E7:85:C8:84:39:93:A4:
  • 3B:62:1A:04:36:01:67:51