Yes it can be done, you need to set up aliases as I recall to redirect the email. My box is a bit broken at the minute so I can't get details. I did it so long ago! I think I got the info from a great tutorial on the redhat site. try serching for postfix and redhat together in google. This willl apply to most distros not just redhat. If I get my box sorted I will further post more info later.
Good luck
Iain
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