[thumbnail="pmg-gui-mailproxy-relaying.png", big=1]
endif::manvolnum[]
-These settings are saved to the 'mail' subsection in `/etc/pmg/pmg.conf`,
-using the following configuration keys:
+These settings are saved to the 'mail' subsection in `/etc/pmg/pmg.conf`. Some of these correspond
+to postfix options in the `main.cf` (see the
+https://www.postfix.org/postconf.5.html[postconf documentation]).
+
+They use the following configuration keys:
include::pmg.mail-relaying-conf-opts.adoc[]
[thumbnail="pmg-gui-mailproxy-ports.png", big=1]
endif::manvolnum[]
-These settings are saved to the 'mail' subsection in `/etc/pmg/pmg.conf`,
-using the following configuration keys:
+These settings are saved to the 'mail' subsection in `/etc/pmg/pmg.conf`. Many of these correspond
+to postfix options in the `main.cf` (see the
+https://www.postfix.org/postconf.5.html[postconf documentation]).
+
+They use the following configuration keys:
include::pmg.mail-ports-conf-opts.adoc[]