Policyd is an anti-spam plugin for Postfix that does greylisting, sender (envelope, SASL, or host/IP)-based throttling (on messages and/or volume per defined time unit), spam trap monitoring/blacklisting, HELO auto-blacklisting, and HELO randomization prevention (HRP). License: GNU General Public License (GPL) Changes: This release adds support for message count and cumulative message size quotas.

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