For those who want an easy to setup anti virus I highly recommend the use of clamassasin combined with ClamAV and Procmail.
First you’ll need to setup your MTA and Procmail as usual, then get clamassassin from [http://drivel.com/clamassassin/].
Download the package supplied and extract it, and follow the README file.
formail is part of Procmail remember, not a separate package. Also mktemp is most likely already on your system [1], to test try it on the command line, if you don’t get a command not found error then you should be OK.
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