Howtoforge posted a guide about setting up Debian Lenny (Debian 5.0) With BIND & Dovecot

This tutorial shows how to prepare a Debian Lenny (Debian 5.0) server for the installation of ISPConfig 3, and how to install ISPConfig 3. ISPConfig 3 is a webhosting control panel that allows you to configure the following services through a web browser: Apache web server, Postfix mail server, MySQL, BIND nameserver, PureFTPd, SpamAssassin, ClamAV, and many more. This tutorials differs from The Perfect Server - Debian Lenny (Debian 5.0) [ISPConfig 3] in that I use BIND and Dovecot here instead of MyDNS and Courier (of course, the other two variants - BIND & Courier or MyDNS and Dovecot are possible as well).

The Perfect Server - Debian Lenny (Debian 5.0) With BIND & Dovecot (ISPConfig 3)