HOWTOForge is a great place to pick up some great guides on setting up your server.
Here:
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.
He goes through every stage, from soup to nuts, of all the issues and steps involved in getting your mail up to the level you want it at.
The link for this article located at howtoforge.com is no longer available.
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