I would recommend clamav.
http://clamav.elektrapro.com
For integration with mail, you can find instructions for using it with
qmail at:
http://www.qmailrocks.com
I recently got my damned Linux box up and running and
fully plan on using
it as a web/email server. Is there a decent and as close to free as
possible (hey, I admit it, I'm poor) antivirus that supports scanning of
email on the server?
-John
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Founder, Lead Writer, Tech Analyst
and Web Designer Boff-Net Technologies
http://boff-net.dhs.org/index.html
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To Sleep, Perchance to Dream. For in that sleep of death what dreams may
come when we shuffle off this mortal coil must give us pause