Norton AntiVirus and Mail Rules

Has anyone experienced this :

I’m using Mail Rules to move mails with any .exe , .scr , .com ,… attachment to a special database.

I have Norton Anti-virus (2.0) installed on the same server.

It looks as the mail rule intercepts the message, that NAV doesn’ scan the message. Also when the message is moved to the special db, NAV doesn’t scan the document.