Setup SquirrelMail today for tonns.com. I only did it because it was just way too easy! Used the CentOS rpms for squirrelmail and php, added the lighttpd-fastcgi rpm from RPMForge (thanks Dag!), ran conf.pl tweaked lighttpd a little and was up and running in only a few minutes. It is very crude in its configuration, but it will serve in a pinch. I might TLS it as well later, but for now, it will do just fine.