The original message was received at Tue, 13 Feb 2007 10:08:24 -0600 from [214.72.29.117] ----- The following addresses had permanent fatal errors ----- <redhat-cz na linux.cz> ----- Transcript of session follows ----- ... while talking to linux.cz.: 550 5.1.2 <redhat-cz na linux.cz>... Host unknown (Name server: host not found)