Recommended spam solutions?

[Fire walls via amavis-users]

Hi.

 I'm working on my new spam gateway, this one has the normal tools:
amavisd-new, clamd, spamassassin, postgrey, some spam site zen, etc.

 My question is simple, what other tools u have working with great success
to add to this team?

 This team block a lot, but I want to block more spam.

 Any tip will be appreciated, thanks.

-- 
:-)
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