help blocking outgoing spam from hosting server

I've been looking thru many posts and can't find the solution to this question. I have a server at rackshack.net, that I'm using for hosting, running linux/red hat and H-sphere cp.
Everyone knows rackshacks tough spaming policy. I want to protect our server from being used for spaming.
If you have a program or script, I would like to hear about it and the directions for the install. You just can't catch all people at signup.
Thanks

 

 

 

 

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