# Keep retry messages in queue for 4 days max max-queue-lifetime 4d # How often to attempt redelivery of deferred mail retry-interval 30m Use code with caution. 🚀 Validating and Applying Changes Safely
: After editing the file, you must restart the service for changes to take effect: service pmta restart systemctl restart pmta Windows: Use net stop pmta followed by net start pmta sample configuration template
: After making changes, use the command pmta reload to apply updates without a full service restart, or service pmta restart if a restart is required for specific directives.
: Separates global server settings from frequently changed routing rules.