On Sat, Jan 16, 2016 at 04:00:48PM +0800, Paul Goyette wrote:
> my_smtp:12345 inet n - n - - smtpd
>
> But it's not clear to me if this syntax will define a new listener (in
> which case this would belong on my primary-MX machine) or if this would
> enable an _outgoing_ connection to primary-MX's port 12345 (in which
> case this would belong on the backup-MX machine).
Does the documentation patch below help:
--
Viktor.
diff --git a/proto/master b/proto/master
index 8f54459..740c5d5 100644
--- a/proto/master
+++ b/proto/master
@@ -55,8 +55,12 @@
# Specify one of the following service types:
# .RS
# .IP \fBinet\fR
-# The service listens on a TCP/IP socket and is accessible
-# via the network.
+# The service listens on a TCP/IP socket and is accessible via the
+# network. Services that receive incoming mail use this service type,
+# either directly as with smtpd(8), qmqpd(8) or indirectly as with
+# postscreen(8). Do not confuse the smtp/inet service which receives
+# inbound mail via smtpd(8) with the smtp/unix service which sends
+# outbound mail via smtp(8).
#
# The service name is specified as \fIhost:port\fR, denoting
# the host and port on which new connections should be
@@ -79,8 +83,14 @@
# of hard-coding loopback IP address information in master.cf
# or in main.cf.
# .IP \fBunix\fR
-# The service listens on a UNIX-domain socket and is accessible
-# for local clients only.
+# The service listens on a UNIX-domain socket and is accessible for local
+# clients only. Delivery agents that implement Postfix \fItransports\fR
+# use this service type. Thus, for example, master.cf(5) entries for
+# outbound mail sent by smtp(8), have \fBunix\fR as their service type.
+# Other delivery agents include lmtp(8), local(8), virtual(8), pipe(8),
+# error(8), retry(8) and discard(8). Do not confuse the smtp/inet
+# service which receives inbound mail via smtpd(8) with the smtp/unix
+# service which sends outbound mail via smtp(8).
#
# The service name is a pathname relative to the Postfix
# queue directory (pathname controlled with the \fBqueue_directory\fR
