Howtoforge posted a guide about setting up Ubuntu 10.04 as perfect server

This tutorial shows how to set up an Ubuntu Lucid Lynx (Ubuntu 10.04) server that offers all services needed by ISPs and hosters: Apache web server (SSL-capable), Postfix mail server with SMTP-AUTH and TLS, BIND DNS server, Proftpd FTP server, MySQL server, Courier POP3/IMAP, Quota, Firewall, etc. In the end you should have a system that works reliably, and if you like you can install the free webhosting control panel ISPConfig 2 (i.e., ISPConfig runs on it out of the box).

The Perfect Server - Ubuntu Lucid Lynx (Ubuntu 10.04)