Postfix Mail Server Please help

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http://www.linuxquestions.org – Please, can some one how me how to implement procmail postfix for content filtering purposes? I already said some thing like this though. But is there any way to let postfix server run am program that is on windows? This program only goes to the database and check to see if the person who send the email is in the data base, then the mail server will use it's EXITCODE to take an action. I hope the gurus can help me with this. Thanks (HowTos)