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Spey
Spey is a smart SMTP proxy that provides an easy way to add greylisting to your mail setup....
dgrey
dgrey is a greylisting policy server that allows greylist information to be synchronized between multiple e-mail servers....
Sdbgrey
Sdbgrey is a greylisting policy server for Postfix....
Postgrey
Postgrey is a Postfix policy server implementing greylisting developed by David Schweikert at the ISG.EE....
greylisting email filter implementation Postfix server greylisting implementation
Gld
Gld is a standalone greylisting server for Postfix....
server mail filter greylisting greylisting server Postfix greylisting