Your mail 202.40.187.2:4185->87.238.46.8:25 contains contaminated file _From__Post_Office___MAILER_DAEMON_projects.linpro.no___Date_22_May_2011_13:32:47__Subj_Delivery_reports_about_your_e_mail_/letter.com with virus Email-Worm.Win32.Mydoom.m,so it is dropped.