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Setting up a mailserver on OpenBSD 6.9: PF configuration
F. Adjust pf.conf
With this setup we will use imap and smtp.
1. Add to pf.conf on the firewall:
...
mailserver = "10.1.1.2"
email_ports = "{ smtp, imap, imap3, 465, submission, imaps }"
...
# Direct email traffic to smtp server
pass in on egress inet proto tcp from any to (egress) port $email_ports rdr-to $mailserver2. Add to pf.conf on mailserver:
...
email_ports = "{ smtp, imap, imap3, 465, submission, imaps }"
...
# Pass in traffic to mailserver
pass in on egress inet proto tcp from any to ( egress ) port $email_ports3. Now try to send an email to john@example.com from Gmail or other remote mail service. Check as above whether it is received.
You can't send mail yet, but at least 1/2 of the server is functional.
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Previous: Initial OpenSMTPD configuration
Posted by Gordon, No Hair Github Pages, August 24, 2021
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