How to do Spam Control in FreeBSD

[dhaneshk k]

Hi  Everbody

  I have a freebsd-6.0 server with postfix and mailman running on this 
machine ,

but I havn't configured spamassasin ,amavisd etc in this box. so I am 
suffering from spams daily ..

Since I am a new be to FreeBSD ,  let me requset you to share your expertise 
(the steps how to install & configure  spamassasin,amavisd  in  this box )

( Genaral question : Is  there  any port for spamassasin,amavisd in FreeBSD)

Thanks in Advance
Dhanesh

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