We aren’t doing this anymore, we are doing it all through amavisd-new

For virus filtering do the following:

Add to /etc/apt/sources.list:

deb http://people.debian.org/~aurel32/BACKPORTS stable main

Run apt-get update

Install the following packages: clamav clamav-base
clamav-freshclam clamav-daemon lha lzop unarj unzip zoo unrar

In /etc/sympa.conf put the following parameters:

antivirus_path  /usr/bin/clamscan

antivirus_args --stdout --unzip --unrar --arj --unzoo --lha

Change the template your_infected_msg.us.tpl so it has proper
english grammar, grabs the email correctly and lets people know where
they can email for help:

From: [from]
Subject: A virus in your email

    V I R U S    A L E R T 

Our viruschecker found a virus named [virus_name]
in a message adressed to [recipient] that seems to have come
from your email address (From: [user->email]).

We stopped delivery of this email.

We suggest that you scan your machine for viruses, after making sure
that your virus definitions are up-to-date.

Contact list-help@riseup.net if you have problems.