sovereign/roles/mailserver/DESIGN.md

Design Description for Mailserver Role

Mail filters

Four mail filters are used:

• Postgrey, which runes on port 10023 and is hooked into postfix with the smtpd_recipient_restrictions variable;
• OpenDKIM, which runs on port 8891;
• OpenDMARC, which runs on port 54321; and
• Rspamd, which runs on port 11332.

OpenDKIM, OpenDMARC, and Rspamd are all hooked into postfix with the smtpd_milters variable. All of this can be found in etc_postfix_main.cf.