ACL Policy Daemon communicates with the Postfix MTA using the Policy Delegation Protocol, implementing an ACL (Access Control List) system. Key features: greylisting with flexible storage using memory for fast responses or disk for high persistence, SPF validation, control of messages by day/time, variable message size limits per domain or email, multiple RBL checking, and various ACLs available to use and combine. The configuration is simple and intuitive. License: GNU General Public License (GPL) Changes:
Improved init scripts for Debian and Red Hat like distributions. A fixed for a bug when loading ACL values from a file. Greylisting ACL now has the default values time=5, lifetime=1440, backend=memory, and root=/var/cache/apolicy. A new timeout parameter is available in main.conf. There is a new memcached backend for greylisting ACL (experimental).