What version of Outlook? What kind of e-mail account? (POP? IMAP?
Exchange?) What anti-virus are you running? When did this problem
start? What operating system are you using it on?
What version of Outlook do you use? What type of email account do you have
(Exchange, POP3, etc.)? Are your senders using stationery perhaps? Does your
antivirus attach a message to every incoming email?