I played with hosting emails for my domains on the OS X server and had a few little snags... I tried it on a linux server with huge snags (never got it running) then started looking for paid hosts for email, then remembered that Google can host emails for your domain (and its free in beta) what a cool service, you can set it up in minutes, google.com/a I think is the link... check it out and enjoy. you can read a little more on it on my site.
DD
DD