Alternatively try ClarkConnect, used in it several small businesses in the past. A very nice web-based management system. We use a custom Fedora based setup on our servers here but for small servers I would reccomend Postfix - Procmail - Dovecot for a very stable setup.
Andrew Hutchings (A-Wing) - Linux Guru
Linux Forums - http://www.linuxforum.co.uk/
Linux CDs and DVDs - http://www.linuxiso.co.uk/
Random quote 72: "Every time you turn on your new car, you're turning on 20 microprocessors. Every time you use an ATM, you're using a computer. Every time I use a settop box or game machine, I'm using a computer. The only computer you don't know how to work is your Microsoft computer, right?" - SCOTT McNEALY, CEO, Sun Microsystems