there are numerous howtos for a few setups, such as
postfix/dovecot/mysql
postfix/dovecot/postgresql
postfix/courier/
probably for exim too
A good starting point would be to figure out what exactly you want.
then search in that direction.
have a look at
postfix
courier
dovecot
cyrus
saslauthd
mysql/postgresql if you decide to add a db to it.
howtoforge.com has a few howtos on those too
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