@ sino983 [#1019]

T-Online hat des öfteren Probleme mit ihren Mail Servern welche wegen SPAM-Versenden blockiert sind.

Ich hatte das Problem auch mal und bekam von meinem Host der das mal investierte folgende Nachricht.

xxx
The IP that the blocked email was sent with [194.25.134.20] is blocked by HostKarma and SORBS for sending spam.
It is not going to be possible to whitelist all of 't-online.de' IP addresses.
I can see later emails from xxxxxx@t-online.de did get through as they were sent from other IP addresses that are not blacklisted.
The only solution would be for the sender to retry sending the email and hope it gets sent by another of t-online.de IP addresses that is not blacklisted.
xxx