Well you can always send me a note
I've been using this system for about a year now, and its great. I run it on a PII 400 with 256MB of RAM and its more than enough. Courier-imap works great with outlook, much better than MecuryMail which runs on Windows. And having the horde/imp webmail when Im away from home is great.
One thing I'll tell you up front is when you install RH 7.3 make it as barebones as possible. Just apache, the MySQL components, PHP, etc. No X, window managers, printing support, games

, etc. My RH install was about 600MB for this.