ZZTopping

Exim4 is a very powerful MTA(the default for Debian Etch). Getting started with it is a bit daunting, and I found the official website too chock full of info to be useful for a newbie.

These two sites help quite a bit:

http://www.techcuriosity.com/resources/exim/exim.php

http://bradthemad.org/tech/notes/exim_cheatsheet.php

This page has a good single-page command line admin reference for the popular exim MTA(the default MTA for Debian Etch).

I found it very useful.

http://bradthemad.org/tech/notes/exim_cheatsheet.php