Postfix is good, have you read through the dox on the postfix website?
Specifically: http://www.postfix.org/VIRTUAL_README.html

Its not the most readable thing out there, but the information is correct.

Some other questions:

How many domains are you going to support now?

How many domains are you going to support in the future?

How many users per domain?

Personally I don't bother with AV at the mailserver, as I've not had good
experiences with it (Vexira is another story, but thats not free).  I do use
spam filtering though, but DSPAM instead of SA.  Currently I'm running 99.765%
accurate for my own personal mail.  It takes time to become that accurate, but
it does work very very well.

I don't much care for Squirrelmail, and Horde/IMP has left me wanting more.
The only webmail app i've been happy with is atmail, but that is commercial.


Sanjay Darisi spoke forth with the blessed manuscript:
> I've installed Postifx (amavisd-new - clamav+spamassassin) + 
> courier-Imap  and inclined towards installing squirrelmail.
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