In my understanding this will only filter the incoming mail, this is ok when the clients are non-Windows (for now). To set up the Courier to filter all mail, the perlfilter can be used in the following manner:

1. Get amavis-ng. I tried to install the rpm-packages found from rpm.pbone.net but they failed on the 7.3 on my target server, I got it to work by installing them manually. Amavis-ng requires a lot of additional perl-modules as well as some external uncompressors (for some reason I could not get the (un)rar to work) 2. Configure the Amavis-ng at /etc/amavis/amavis.conf, the configuration-file contains quite sufficient directives, also make sure that all the directories exists 3. Set Amavis as the perlfilter. by putting the Amavis-program with full path in the /etc/courier/filters/perlfilter 4. Start the filtering with the command: filterctl start perlfilter 5. Test the filtering by sending a test-virus through the server with the configured compression fileformats

I built a working systen with these steps on a RH-7.3 with Courier-0.41 + Amavis-ng-0.1.6.4 and F-Secure AV, I also did a preliminary test on a RH-8.0 with Courier 0.43 and F-Prot with similar results.

Poltsi