Howtoforge posted a tutorial about setting up Ubuntu 11.10 as server with ISPConfig 3
This tutorial shows how to prepare an Ubuntu 11.10 (Oneiric Ocelot) 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 or MyDNS nameserver, PureFTPd, SpamAssassin, ClamAV, and many more.