-= exiscan 2.4 =-   by Tom Kistner <tom@duncanthrax.net>

URL: http://duncanthrax.net/exiscan/

Please see INSTALL for installation instructions. INSTALL also covers the 
prerequisites needed for exiscan.

Exiscan is an email virus scanner which works together with the Exim MTA
(http://www.exim.org). It is written in Perl and designed to be very easy
to implement. Exiscan supports multithreaded unpacking and scanning of mail,
with a configurable number of processes. Exiscan has generic support for
available command line virus scanners. Exiscan can scan inside of MS-TNEF
and SMIME (signed) wrapped messages.

Exiscan also features a simple regular expression and file extension
blocking tool to fend off very new viruses.

exiscan differs from other email virus scanners in a number of ways:

	- Mails are NOT resent after being scanned. Re-sending
	  email can introduce a number of problems that should be
	  avoided. Exiscan takes emails out of the queue, scans then
	  and marks them as "good" by adding a line to the header.
	  This decreases CPU load significantly, as each mail has to
	  be delivered only once, not twice as with other scanners.

	- Exiscan tags messages, so when they get resent through pipes
	  or aliases, it does not scan them again.

	- unpacks MS-TNEF and SMIME wrappers (MIME in TNEF / MIME in MIME)


This program is distributed under the terms of the GPL. A copy of the GPL
can be found in LICENSE.
