Greylite is a SPAM filter with exceptional effectiveness and no 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 is self-contained because it uses SQLite, and is easy to setup and maintain, small, and fast. License: BSD License (revised) Changes: The "354 go ahead (in reply to RCPT TO command)" bug was fixed when responding to non-suspicious clients at the second delivery attempt.

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