Best route for RHEL AS 3

[Alex Thomas]

Due to benevolent university, I am about to build a cyrus-imap server on 
Redhat Enterprise Linux 3 revision 3.  Does anyone have any suggestions 
or gottchas that I should look for.  Plan is to use this server to in 
addition to serving email on its own, collect email from various other 
accounts so I have one place for all my email. I want server-side 
spam-detection and virus scanning in addition to server-side mail 
sorting.  I am MTA agnostic, but would prefer either postfix or sendmail 
as I want to change default install as little as possible.

Thank you for any help I can get.
Alex
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