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Postfix greylisting policy service with auto-white-listing written in Perl with SQL database as storage backend. Greylisting stops 50 to 90 % junk mails (spam and virus) before they reach your Postfix server (saves BW, user time and CPU time).
Patch / add-on for qmail, written in C and using PostgreSQL as database backend in order to implement an anti-spam method known as "greylisting". The patch behaves and performs nicely, while reducing resources needed for handling email traffic.