External SMTP relay server with antispam

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http://forums.cpanel.net – Hello, we´re looking to implement an external smtp relay to forward all our outgoing traffic from our cpanel servers. We need to implement antispam filter in the relay server, we´re are thinking in a solution that detect spam with spamassasin and according to the score relay it, delete it or store it in a review folder for future approval o deletion. Anyone has done something like this ? Is a complete solution like this or I´ll start coding sripts over exim ? Regards, RDA.- (HowTos)