qmail vs. xmailserver (little OT)

Hi there! 1. I would like to setup a medium ISP mail server (about 200 users, 2000 messages/hour, upto 500.000/hour in case of serious spam) and I am still not quite sure: qmail or xmailserver? It has to be a webmail-capable server, too... 2. Do you have rpm's for any one of the above servers? For SuSE 8.2, if possible, of course ;) Thank you! Radu