Seeking recommendation for anti-spam software

[Richard Coleman]

I am running a mail server using Postfix and Dovecot.  I would like to 
hear people's recommendation for which port to use to add server side 
anti-spam.  The problem these days is a richness of choices, so it's 
hard to know port which to try.

And call it a quirk of mine, but I really dislike (server) software with 
a large number of dependencies.  That rules out Spam Assassin.  But I am 
fairly conversant with mail and Postfix/Dovecot in general, so I don't 
mind any integration work.

I apologize if this has been discussed before, but I just joined the 
list (I am already on so many FreeBSD lists already).  I appreciate any 
insight that people can offer.

Richard Coleman
rcoleman at criticalmagic.com