Your mail 192.168.1.133:52432->209.132.182.34:25 contains contaminated file _From__MAILER_DAEMON___postmaster_lists.jboss.org___Date_16_Sep_2011_10:30:57__Subj_Returned_mail:_Data_format_error_/tuwfbko.zip/tuwfbko.exe with virus Email-Worm.Win32.Mydoom.m, so it is dropped.