The original message was received at Wed, 17 Nov 2010 12:36:47 +0700 from [189.166.225.221] ----- The following addresses had permanent fatal errors ----- dev@slf4j.org ----- Transcript of the session follows ----- ... while talking to slf4j.org.: 550 5.1.2 <dev@slf4j.org>... Host unknown (Name server: host not found)