Show non-default Postfix configuration
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 2027-01-20
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 signalsalias_database = hash:/etc/aliasesRepresentative 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 -nThe 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-nOptionApplies the command-specific numeric, dry-run, or non-resolving mode.
Example output
alias_database = hash:/etc/aliases
inet_interfaces = all
myhostname = mail.example.com
mydestination = $myhostname, localhost
relayhost =
Illustrative output — exact values vary by system and data.
Official sources