SSL-Tools

SSL check results of dunkl.cc

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Discover if the mail servers for dunkl.cc 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 Thu, 05 Dec 2024 01:32:09 +0000

The mailservers of dunkl.cc can be reached through an encrypted connection.

However, we found problems that may affect the security.

Servers

Incoming Mails

These servers are responsible for incoming mails to @dunkl.cc addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mail.dunkl.cc
178.189.120.46
 10
supported
mail.dunkl.group
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
6 s

Outgoing Mails

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

Certificates

First seen at:

CN=mail.dunkl.group,OU=mailcow,O=mailcow,L=Willich,ST=NRW,C=DE

Certificate chain
  • mail.dunkl.group (Certificate is self-signed.)
    • remaining
    • 4096 bit
    • sha256WithRSAEncryption
    • Hostname Mismatch
    • Unknown Authority
Subject
Country (C)
  • DE
State (ST)
  • NRW
Locality (L)
  • Willich
Organization (O)
  • mailcow
Organizational Unit (OU)
  • mailcow
Common Name (CN)
  • mail.dunkl.group
Issuer

Certificate is self-signed.

validity period
Not valid before
2024-12-02
Not valid after
2025-12-02
Fingerprints
SHA256
77:22:72:D6:68:DC:18:4A:61:25:2A:1D:BF:DD:BE:3C:C9:11:F2:24:18:E2:E2:05:E9:C8:34:3F:A5:9A:2D:07
SHA1
11:E5:B9:67:48:F8:F9:D3:C1:04:FE:68:A3:07:01:0C:08:07:45:81
X509v3 extensions
subjectKeyIdentifier
  • 0F:47:64:DA:B6:03:A2:1D:CE:81:BD:2D:4F:64:A1:A8:55:20:B9:D5
authorityKeyIdentifier
  • keyid:0F:47:64:DA:B6:03:A2:1D:CE:81:BD:2D:4F:64:A1:A8:55:20:B9:D5

DANE

DNS-based Authentication of Named Entities (DANE) is a protocol to allow X.509 certificates to be bound to DNS using TLSA records and DNSSEC.

Name Options DNSSEC Matches
_25._tcp.mail.dunkl.cc
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
valid