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.
Greylite implements a modified greylisting algorithm that improves the filtering effectiveness and minimizes the delay drawbacks associated with the standard greylisting algorithm.
Greylite is licensed BSD. See the BSD license content for details.
Greylite can be downloaded in the greylite releases page.
There are greylite packages for several package-managers you may be interested in.
You can use freshmeat to get notified on updates and releases. Just subscribe its greylite node.
Contact mij@bitchx.it. Your problems/questions may be reused in the FAQ page.
Greylite is accompanied by a thorough documentation:
You like greylite? See the appreciators page.