I'm currently running a server on a G4 Cube with Apache and named on Mac OS X. SMTP and POP are not part of the public beta. There is a commercial package from stalker software called CommuniGate Pro which can do those as well as IMAP4, but it is expensive. I'm running a trial version of it...
Actually if you want to get unix-y there is a much simpler way. When you get a crash or restart, immediately after you restart hold down the "s" key.
After you see the mac icon it will go to a black screen with white text, then let go of the "s" key. It will print alot of text and finally...