If your AV has resident protection that is constanstly looking for viruses and checking all .exe's before they are opened, is an email scanner really needed? In this case, what benefit would that scanner provide? For example, Avira Antivir seems to be an exceptional AV. The free version does not scan emails, but you are supposed to be safe due to the resident protection. So what exrtra benefit does the email scanner in the paid version provide?