Pop3Vscan is a transparent pop3 proxy, which can be used to scan all pop3 communication going through the router. You can for example use it to protect a small network by scanning all outgoing pop3 connections. Use with pop3vscan is quite easy.
I used Debian to do it, so I just installed pop3vscan from testing (apt-get -t testing install pop3vscan). You can try to fetch pop3vscan from your distribution or compile according to howto.
The important part of configuration is this:
virusregexp = .*: (.*) FOUND
scanner = /usr/bin/clamscan --disable-summary -i
scannertype = basic
Don't forget to add iptables rule, which will direct all pop3 traffic to pop3vscan first:
/sbin/iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 110 -j REDIRECT --to-port 8110
Change eth1 to your local network's interface name (all request coming from this network interface will be directed to pop3vscan).
One page links to ClamAvPopVscan:
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