SSL-Tools

SSL check results of dettmanns.de

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Discover if the mail servers for dettmanns.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, 28 Jan 2026 17:02:07 +0000

We can not guarantee a secure connection to the mailservers of dettmanns.de!

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

/mailservers/dettmanns.de

Servers

Incoming Mails

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

Hostname / IP address Priority STARTTLS Certificates Protocol
mx1.dettmanns.de
2a02:a00:e012:4b10::1:12
Results incomplete
5
unsupported
not checked
DANE
errors
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
11 s
mx1.dettmanns.de
46.41.1.145
 5
supported
mx1.dettmanns.de
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
8 s
mx1.core-networks.de
2001:1bc0:d::4:9
 10
supported
mail.core-networks.de
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
mx1.core-networks.de
82.96.72.7
 10
supported
mail.core-networks.de
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s
mx2.core-networks.de
2001:1bc0:d::2:12
 20
supported
mail.core-networks.de
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
mx2.core-networks.de
194.213.5.212
 20
supported
mail.core-networks.de
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s

Outgoing Mails

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

Certificates

First seen at:

CN=mx1.dettmanns.de

Certificate chain
  • mx1.dettmanns.de
    • remaining
    • 384 bit
    • ecdsa-with-SHA384
      • E8
        • remaining
        • 384 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • mx1.dettmanns.de
Alternative Names
  • mx1.dettmanns.de
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • E8
validity period
Not valid before
2025-12-18
Not valid after
2026-03-18
This certifcate has been verified for the following usages:
  • Digital Signature
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
D6:7A:64:D2:30:59:2D:B3:47:FA:68:EC:1E:BD:15:E8:C6:33:F1:74:94:80:6D:46:F0:09:8E:E0:72:2E:83:75
SHA1
3D:19:03:58:FE:0D:6D:6D:AD:64:F7:D6:13:87:50:1B:2B:E6:03:72
X509v3 extensions
subjectKeyIdentifier
  • 5C:98:B4:AA:BC:B3:1C:D1:99:9D:56:AC:FD:43:73:29:16:56:7D:12
authorityKeyIdentifier
  • keyid:8F:0D:13:A2:F6:2E:7E:D1:50:6C:33:18:38:5D:59:8E:23:72:91:CA
authorityInfoAccess
  • CA Issuers - URI:http://e8.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://e8.c.lencr.org/108.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 0E:57:94:BC:F3:AE:A9:3E:33:1B:2C:99:07:B3:F7:90:
  • DF:9B:C2:3D:71:32:25:DD:21:A9:25:AC:61:C5:4E:21
  • Timestamp : Dec 18 18:23:28.871 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:A9:A2:49:0C:22:FB:01:A4:95:57:E8:
  • A1:EE:19:D6:C0:D6:C4:3D:3A:D7:97:0F:0F:32:EC:C9:
  • 65:F7:48:50:74:02:21:00:F3:E8:10:DF:C3:3A:EC:95:
  • 4E:7E:61:BD:23:4B:98:87:DF:EE:93:47:7B:A0:EA:9D:
  • 7A:DA:38:2B:A1:32:B6:82
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : E3:23:8D:F2:8D:A2:88:E0:AA:E0:AC:F0:FA:90:C9:85:
  • F0:B6:BF:F5:D2:A5:27:B0:01:FC:1C:44:58:C4:B6:E8
  • Timestamp : Dec 18 18:23:29.523 2025 GMT
  • Extensions: 00:00:05:00:2C:82:72:70
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:E9:55:85:91:21:2C:98:41:A8:E3:58:
  • 5E:BB:CA:79:25:8A:8E:BF:9B:86:2E:02:15:0D:5B:79:
  • BB:3C:A7:6D:F7:02:21:00:B6:14:E7:E7:51:66:B2:7E:
  • 2F:83:CC:43:D6:B6:C8:D9:D3:E7:9A:68:66:31:5D:61:
  • D8:D1:C1:C1:19:17:D0:40
First seen at:

CN=mail.core-networks.de

Certificate chain
  • mail.core-networks.de
    • remaining
    • 2048 bit
    • sha256WithRSAEncryption
      • R12
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • mail.core-networks.de
Alternative Names
  • mail.core-networks.de
  • mx.core-networks.com
  • mx.core-networks.de
  • mx.core-networks.eu
  • mx1.core-networks.de
  • mx2.core-networks.de
  • mx2.core-networks.eu
  • mx3.core-networks.com
  • mx3.core-networks.de
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R12
validity period
Not valid before
2025-11-08
Not valid after
2026-02-06
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
48:9B:AF:7A:79:08:DC:D4:79:5F:0F:80:8D:86:E8:9A:1C:9E:7A:6B:FF:E9:EA:48:2D:5B:46:38:99:F3:70:6D
SHA1
C8:FD:47:91:3A:8C:6A:C6:72:0E:DF:A6:06:85:A9:B4:E4:39:50:42
X509v3 extensions
subjectKeyIdentifier
  • 70:08:D7:A2:D0:78:6A:89:7D:F5:BC:CF:C2:D2:A3:7E:B6:7F:49:32
authorityKeyIdentifier
  • keyid:00:B5:29:F2:2D:8E:6F:31:E8:9B:4C:AD:78:3E:FA:DC:E9:0C:D1:D2
authorityInfoAccess
  • CA Issuers - URI:http://r12.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r12.c.lencr.org/116.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 64:11:C4:6C:A4:12:EC:A7:89:1C:A2:02:2E:00:BC:AB:
  • 4F:28:07:D4:1E:35:27:AB:EA:FE:D5:03:C9:7D:CD:F0
  • Timestamp : Nov 8 11:15:03.106 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:9A:3F:12:A7:91:27:57:59:8C:5A:84:
  • E6:B2:F8:E6:D2:E6:85:FE:36:C0:DC:47:E9:C8:BA:00:
  • 6B:33:43:17:A9:02:21:00:C4:24:8B:5C:39:BD:96:04:
  • 07:58:C8:2D:BD:4A:E0:E5:EA:C9:5E:41:19:3B:FC:4E:
  • 9D:A9:EC:84:BE:0D:41:D1
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 0E:57:94:BC:F3:AE:A9:3E:33:1B:2C:99:07:B3:F7:90:
  • DF:9B:C2:3D:71:32:25:DD:21:A9:25:AC:61:C5:4E:21
  • Timestamp : Nov 8 11:15:03.106 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:CA:DC:22:7D:0B:CF:F4:73:B1:5A:F7:
  • FE:29:3A:C5:B6:56:FB:0B:6F:65:F3:C2:80:A9:90:90:
  • 63:4F:F9:41:FB:02:20:4A:68:8C:F9:67:B1:DE:71:9F:
  • 46:4F:29:B9:81:A6:F1:A0:EB:BD:99:AA:C1:62:0D:6D:
  • AD:BF:3A:92:30:39:91

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.mx1.dettmanns.de
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
valid
_25._tcp.mx1.dettmanns.de
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
—
_25._tcp.mx1.core-networks.de
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
valid
_25._tcp.mx2.core-networks.de
  • DANE-EE: Domain Issued Certificate
  • Use subject public key
  • SHA-256 Hash
valid
valid