Howtoforge posted a tutorial about setting up virtual users with Postfix, Dovecot, MySQL, RoundCube, iRedAdmin on Debian 6 (Squeeze)
This document describes how to install a Postfix and Dovecot mail server that is based on virtual users and domains, i.e. users and domains that are in a MySQL database. If you prefer to install such a mail server step by step, you can refer to the ISPmail tutorials at workaround.org. Also the Big Picture would help you to easily understand the mail server structure. I believe you at least need one day to have a working mail server that way. If you use the iRedMail script, you only need one minute to get the mail server up and running, and you will have more features (compared to the ISPmail tutorials).Virtual Users With Postfix, Dovecot, MySQL, RoundCube, iRedAdmin On Debian 6 (Squeeze)
