How do you pevent your users from spamming?

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This web hosting review was started by Aajnabee.king on 2009-04-13 04:13:34:

Dear,

I am just wondering, a lot of the people order hosting pakage and start spamming. Spamming on company’s email server will get them blacklisted by many anti-spam filters around the world. This kind of damage not only affects only company, but all of their clients.
Then how do you prevent your users from spamming across the world. What technique or software do you use?

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