The original message was received at Sat, 4 Jul 2009 14:46:38 +0200 from [88.239.148.137] ----- The following addresses had permanent fatal errors ----- <po3156.98.4l.student.gymnazium(a)gymzn.cz&gt; (reason: 550 No such recipient) ----- Transcript of session follows ----- ... while talking to [192.168.1.252]: <<< 550 No such recipient 550 5.1.1 <po3156.98.4l.student.gymnazium@gymzn.cz>... User unknown