[CentOS] Replacing my Scalix mail server

Tue Mar 17 19:24:54 UTC 2009
Robert Moskowitz <rgm at htt-consult.com>

I really need to either upgrade my Scalix server or replace it.

It has to be:

Integrated with anti-spam
IPv6 support
optional anti-virus (processing concerns)

I don't have to be able to port mail from the Scalix to the new server.  
Everyone can just POP their mail.

I have read a bit about Zimbra, it comes as a tar for rhel 5. No rpm 
that I can find.

I also found SME, I have a LOT of questions about it, and am asking on 
their forum board.

Anything else out there I should look for?