SSL-Tools

SSL check results of blu4.de

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Discover if the mail servers for blu4.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, 13 May 2026 10:12:37 +0000

No connection to the mailservers of blu4.de could be established.

Servers

Incoming Mails

These servers are responsible for incoming mails to @blu4.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mx02.goneo.de
2001:1640:5::12:2
Results incomplete
10
supported
*.goneo.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
mx02.goneo.de
85.220.165.130
Results incomplete
10
supported
*.goneo.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
mx01.goneo.de
2001:1640:5::11:2
Results incomplete
10
supported
*.goneo.de
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
mx01.goneo.de
85.220.143.6
Results incomplete
10
supported
*.goneo.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 @blu4.de sender addresses. Test mail delivery

Host TLS Version & Cipher
mout.kundenserver.de (212.227.126.187)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (212.227.126.134)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (212.227.126.131)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (217.72.192.74)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (212.227.17.24)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (212.227.126.135)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (212.227.126.130)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (212.227.17.10)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (212.227.126.133)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (212.227.17.13)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (217.72.192.73)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout.kundenserver.de (217.72.192.75)
TLSv1.3 TLS_AES_256_GCM_SHA384
mout-xforward.kundenserver.de (82.165.159.37)
TLSv1.3 TLS_AES_256_GCM_SHA384

Certificates

First seen at:

CN=*.goneo.de

Certificate chain
Subject
Common Name (CN)
  • *.goneo.de
Alternative Names
  • *.goneo.de
  • goneo.de
Issuer
Country (C)
  • PL
Organization (O)
  • Asseco Data Systems S.A.
Common Name (CN)
  • Certum DV TLS G2 R39 CA
validity period
Not valid before
2026-03-13
Not valid after
2026-09-28
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
71:66:67:DA:D2:3D:24:58:7B:F3:36:FD:C8:F1:B2:7D:54:AD:ED:F0:50:15:D8:94:18:E6:AB:B5:7C:95:27:D2
SHA1
CE:45:29:3A:71:21:AB:0A:39:57:5A:CC:B2:5E:55:BB:68:47:C0:EF
X509v3 extensions
crlDistributionPoints
  • Full Name:
  • URI:http://certumdvtlsg2r39ca.crl.certum.pl/certumdvtlsg2r39ca.crl
authorityInfoAccess
  • OCSP - URI:http://certumdvtlsg2r39ca.ocsp-certum.com
  • CA Issuers - URI:http://certumdvtlsg2r39ca.repository.certum.pl/certumdvtlsg2r39ca.cer
authorityKeyIdentifier
  • keyid:33:A8:77:B7:01:38:6F:5F:1F:24:24:A2:1E:6C:14:E3:6E:22:03:DF
certificatePolicies
  • Policy: 2.23.140.1.2.1
  • Policy: 1.2.616.1.113527.2.101.1
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : D7:6D:7D:10:D1:A7:F5:77:C2:C7:E9:5F:D7:00:BF:F9:
  • 82:C9:33:5A:65:E1:D0:B3:01:73:17:C0:C8:C5:69:77
  • Timestamp : Mar 13 11:06:11.823 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:1F:EB:6E:59:88:23:F9:E6:A8:A2:9A:54:
  • 56:93:0A:83:75:1A:52:4E:7C:C0:E9:E4:76:53:65:96:
  • 7F:1E:7F:73:02:20:3A:6B:C7:1C:B2:A8:9D:97:5D:3B:
  • F0:91:A4:C5:F7:59:38:A0:1C:47:F5:34:96:99:84:12:
  • 46:3A:07:DB:43:DF
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : AF:67:88:3B:57:B0:4E:DD:8F:A6:D9:7E:F6:2E:A8:EB:
  • 81:0A:C7:71:60:F0:24:5E:55:D6:0C:2F:E7:85:87:3A
  • Timestamp : Mar 13 11:06:11.902 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:46:C8:15:44:15:6C:DE:CB:FD:0E:18:ED:
  • C4:F9:7E:61:15:E9:9F:CC:5E:DE:FA:BA:B9:22:CC:BE:
  • 46:6D:28:78:02:21:00:E9:E9:67:65:EE:07:68:15:D3:
  • 4F:B3:20:81:27:C2:49:35:16:BA:EE:07:47:A2:F1:6E:
  • 1A:87:EC:AF:76:C1:DD
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : D8:09:55:3B:94:4F:7A:FF:C8:16:19:6F:94:4F:85:AB:
  • B0:F8:FC:5E:87:55:26:0F:15:D1:2E:72:BB:45:4B:14
  • Timestamp : Mar 13 11:06:11.775 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:CC:5E:E9:15:15:C6:36:D4:82:30:15:
  • A0:6C:12:2A:C8:EA:D8:5C:6C:80:D9:FD:4E:C6:86:C3:
  • F6:59:64:D2:47:02:20:58:EB:FD:BB:BB:01:84:3E:99:
  • 82:DE:98:3F:96:77:54:F2:EB:E8:D7:59:7F:05:29:C2:
  • 1E:75:55:B6:AA:8D:AF