ACL Policy Daemon is a program that communicates with the Postfix MTA using the Policy Delegation Protocol to implement an ACL (Access Control List) system, making it very easy to improve and create controls for your email traffic. It can verify SPF records and do greylisting too. License: GNU General Public License (GPL) Changes: This release adds greylisting support and has complete code refactoring. There are many new ACLs, better documentation, and performance improvements. It's been tested on production servers for some time and has proven to be very stable and reliable.

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