Try Exiscan at
http://duncanthrax.net/exiscan/
It only scans each message once. It requires that you run exim in queue-
only mode. It then scans each message in the queue, and when done with
each message, tells exim to deliver it. I use it with McAfees uvscan. Exiscan
was developed expressly for use with EXIM.
--
Rick Ballard
Halifax, Nova Scotia, Canada
http://www3.ns.sympatico.ca/rick.ballard