greylite

Modified greylisting for qmail and for any other MDA

Greylite is a SPAM filter with exceptional effectiveness and without false positives. It combines natively with qmail and works as a proxy for any SMTP server. It implements a modified greylisting algorithm that improves the filtering effectiveness and minimizes the delay drawbacks associated with the standard greylisting algorithm. It can be tuned to recognize suspicious clients and reject their attempts multiple times, reaching filtering rates of over 99% without false positives. Greylite is easy to setup and maintain, and it is small and fast.