ClamSMTP is an SMTP filter that allows you to check for viruses using 
the ClamAV anti-virus software. It accepts SMTP connections and forwards 
the SMTP commands and responses to another SMTP server. The 'DATA' email 
body is intercepted and scanned before forwarding.

ClamSMTP aims to be lightweight, reliable, and simple rather than have a 
myriad of options. It's written in C without major dependencies. If you 
need more options then you could use something big like AMaViS which is 
written in PERL and can do almost anything.

Author:	Nielsen <nielsen at memberwebs.com>
WWW:	http://thewalter.net/stef/software/clamsmtp/