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
.