DEFCONF(interfaces, m4_ifelse(MODE, satellite, 127.0.0.1 ; ::1,
0.0.0.0 ; ::0))
-## Submission port number. (This is sometimes tweaked for testing.)
+## Main and submission port numbers. (This is sometimes tweaked for
+## testing.)
+DEFCONF(smtp_port, 25)
DEFCONF(submission_port, 587)
## Locations of other configuration files.