Replacing my Scalix mail server

[Robert Moskowitz <rgm@xxxxxxxxxxxxxxx>]

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

It has to be:

Free
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?
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