May 26, 2018
Postfix firewall policy daemon
The program uses the postfix policy delegation protocol to control access to the mail system before a message has been accepted please visit http//www.postfix.org/SMTPD_POLICY_README.html for more information. It allows you to choose an action e.g. reject, dunno for a combination of several smtp parameters like sender and recipient address, size or the client’s TLS fingerprint.