SSL-Tools

SSL check results of t-online.de

NEW You can also bulk check multiple servers.

Discover if the mail servers for t-online.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 Sat, 08 Nov 2025 02:12:12 +0000

No connection to the mailservers of t-online.de could be established.

Servers

Incoming Mails

These servers are responsible for incoming mails to @t-online.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mx02.t-online.de
194.25.134.9
Results incomplete
10
unsupported
not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
mx00.t-online.de
194.25.134.8
Results incomplete
10
unsupported
not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
mx03.t-online.de
194.25.134.73
Results incomplete
10
unsupported
not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s
mx01.t-online.de
194.25.134.72
Results incomplete
10
unsupported
not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
1 s

Outgoing Mails

We have received emails from these servers with @t-online.de sender addresses. Test mail delivery

Host TLS Version & Cipher
mailout06.t-online.de (194.25.134.19)
TLSv1.3 TLS_AES_256_GCM_SHA384
mailout12.t-online.de (194.25.134.22)
TLSv1.3 TLS_AES_256_GCM_SHA384
mailout11.t-online.de (194.25.134.85)
TLSv1.3 TLS_AES_256_GCM_SHA384
mailout04.t-online.de (194.25.134.18)
TLSv1.3 TLS_AES_256_GCM_SHA384
mailout03.t-online.de (194.25.134.81)
TLSv1.2 AECDH-AES256-SHA
mailout07.t-online.de (194.25.134.83)
TLSv1.2 AECDH-AES256-SHA
mailout05.t-online.de (194.25.134.82)
TLSv1.2 AECDH-AES256-SHA
mailout10.t-online.de (194.25.134.21)
TLSv1.2 AECDH-AES256-SHA
mailout02.t-online.de (194.25.134.17)
TLSv1.2 AECDH-AES256-SHA
mailout09.t-online.de (194.25.134.84)
TLSv1.2 AECDH-AES256-SHA
mailout08.t-online.de (194.25.134.20)
TLSv1.2 AECDH-AES256-SHA
mailout01.t-online.de (194.25.134.80)
TLSv1.2 AECDH-AES256-SHA
mout02.posteo.de (185.67.36.142)
TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384
unknown (195.206.106.194)
Insecure - not encrypted!

Certificates

No Certificates found