use ubuntu linux to run your ISP

ISP-Server Setup - Ubuntu 5.0.4 "The Hoary Hedgehog" | HowtoForge - Linux Howtos and Tutorials
I need to take another look at ubuntu, I was looking at the livecd three weeks ago, and wasn't that impressed. I'm going to wipe my laptop and try a complete install we'll see how that goes.

This is a detailed description about the steps to be taken to setup a Ubuntu based server (Ubuntu 5.0.4 - The Hoary Hedgehog) 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/POP3s/IMAP/IMAPs, Quota, Firewall, etc.).