PUBLIC MARKS from falko with tag postgrey

This guide describes how to set up a full email solution in Debian Linux (all code is from Debian Etch). I was asked to design a secure, scalable, portable solution for a small company. While the guide references many servers, the company only had 4 physical machines, Xen was used to virtualize the entire solution. That particular aspect of the system is not discussed in this guide, although I will try to get it into the next revision.

This tutorial will show you how to setup greylisting with Postgrey and Postfix on Debian. Greylisting will not replace spam filtering software like SpamAssassin but it will serve as a powerful first hurdle for spam thus reducing the amount of spam entering the system at all.