Here is an excellent (rate 5+ STAR plus)
The Perfect Setup - Ubuntu 6.06 LTS Server (Dapper Drake)
This is a detailed description about how to set up a Ubuntu 6.06 LTS (Dapper Drake) based server that offers all services needed by ISPs and hosters (web server (SSL-capable), mail server (with SMTP-AUTH and TLS!), DNS server, FTP server, MySQL server, POP3/IMAP, Quota, Firewall, etc.).