Contributed by grey on from the extensive write ups are great dept.
In this article we will look at a way to mitigate the problem of email-borne viruses and Unsolicited Bulk Email (UCE) otherwise known as "spam". The OpenBSD server will act as what I will call a mail filter gateway or MFG. The purpose of such a machine is to protect a network that lies behind it from viruses and spam.
The anti-virus and anti-spam software that will be used will be the popular Clam AV and SpamAssassin programs respectively. They will communicate with the Sendmail MTA via the smtp-vilter milter. This milter comes equipped with its own internal email attachment filter.
Peter also has some other tutorials that may be worth checking out here.
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