The original message was received at Sun, 24 Dec 2006 19:29:27 +0900 from linux.cz [117.122.203.90] ----- The following addresses had permanent fatal errors ----- redhat-cz na linux.cz ----- Transcript of the session follows ----- ... while talking to 201.153.251.78: 550 5.1.2 <redhat-cz na linux.cz>... Host unknown (Name server: host not found)