List effective Postfix master.cf services
Build a paste-ready command, then review its compatibility and effects before running it.
read-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-19
Requirementspostconfpostconf must be installed and available on PATH.
Version supportpostconf Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signalssmtp inet n - y - - smtpdRepresentative successful output; values vary with the selected target and system state.
Known errorspostconf: command not foundpostconf is missing or is not available on PATH.
Verifypostconf -MThe output matches the expected target and exits without an error.Rollback noteNot required: this command is read-only and does not change system state.
Command breakdown
01postconfCommandRuns the postconf stage of this one-liner.
02-MOptionConfigures postconf with the -M option.
Example output
smtp inet n - y - - smtpd
pickup unix n - y 60 1 pickup
cleanup unix n - y - 0 cleanup
Illustrative output — exact values vary by system and data.
Official sources
Related commands