I recommend following this tutorial by Christoph Haas:
http://workaround.org/articles/ispmail-etch/ which will soon be updated
for Debian 5.0 Lenny. There's a community around it, reached through a
mailing list, which gives you a fairly good backing when you need help.
The tutorial is used by a lot of people so it's well proven and in my
experience can be relied upon to just work. The author is a Debian
developer. This was first recommended to me on a Debian IRC channel when I
was trying to piece all the mail server packages together by myself,
probably by Cafuego I think, for which I'm continually grateful. There are
other such tutorials too though I've not tried them.
My own aid to this tutorial is here:
http://thegoldenear.org/toolbox/unices/server-setup-debian-etch.html#mail--
Pete Boyd
Open Plan IT -
http://openplanit.co.ukThe Golden Ear -
http://thegoldenear.org--
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