[adders]

I would definitely recommend using Virtualmin, its a hosting control panel that can control mail/websites/dns in one via a simple control panel.

All works like Plesk, but without breaking everything.

They've got a script that sets up dovecot, postfix, apache, bind, clamav, spamassassin, Mysql, and loads of other hosting software and then you configure every thing via a web interface.

Linux install script is at http://software.virtualmin.com/gpl/scripts/install.sh, instructions at http://virtualmin.com/download