[CentOS] Ultra simple mail server config?

>> I am perfectly fine with leaving out complex
>> server-side spam filtering, though I suspect that some
>> basic blacklist usage would be a good idea. 
>> Most specifically, I don't want to add the security
>> liability  and m caintenance requirements of a typical
>> "default" server. (Apache, PHP, MySQL, Bind, etc.)
>> 
>> Basically, I want an ultra-basic server that I can set
>> for automatic updates and let it continue running
>> "hands-off" until CentOS 4 is no longer supported with
>> security patches.

Have you looked at ASSP? <http://assp.sourceforge.net> ???  It does all 
kinds of protection and sits in front of your mail server.

Barry