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Location: majic-ansible-roles/roles/mail_forwarder/templates/ferm_mail.conf.j2 - annotation

branko
MAR-27: Update mail_forwarder role/tests:

- Install swaks on mail-server instance for testing SMTP.
- Install procmail via mail_forwarder role (needed to be explicit for Debian
Stretch).
- Introduce small sleep when mails are sent to localhost for delivery to remote
hosts before checking the logs in order to allow Postfix to process the
queue.
{% if smtp_relay_host %}
domain ip {
    # Accept incoming connections on port 25 from SMTP relay host.
    table filter {
        chain INPUT {
            # SMTP for server communication.
            proto tcp dport 25 {
                saddr {{ smtp_relay_host }} ACCEPT;
            }
        }
    }
}

{% if lookup('dig', smtp_relay_host + '/AAAA') not in ['NXDOMAIN', ''] %}
domain ip6 {
    # Accept incoming connections on port 25 from SMTP relay host.
    table filter {
        chain INPUT {
            # SMTP for server communication.
            proto tcp dport 25 {
                saddr {{ smtp_relay_host }} ACCEPT;
            }
        }
    }
}
{% endif %}
{% endif %}