Howtoforge posted a tutorial about setting up Debian 6.0 with BIND & Courier on ISPConfig 3

This tutorial shows how to prepare a Debian Squeeze (Debian 6.0) 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.

  The Perfect Server - Debian Squeeze (Debian 6.0) With BIND & Courier on ISPConfig 3