email spam blocking for isp hosting apache

This project was successfully completed by ezbik for $50 USD in a day.

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$30 - $250 USD
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Project Description

I have a hosting www server with several hundreds of custommers, php, postfix. Often some of users have an evil script which generate a spam. I need a solution for avoiding or blocking it without disable users to send legitimate emails from server. Give me overview of your solution and your expertise.

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