::T-Online ::POLIfórum
IP address: 193.224.163.27
IP address to check

Your IP address is listed in a blacklist

EXPLANATION:

The IP address of your mail relay (193.224.163.27) is listed at a blacklist operator, namely b.barracudacentral.org.

SOLUTION:

Contact your internet service provider (the one, who operates the mail relay which you use) and ask them to remove their mail servers from the given blacklist.