Postfix: queue management commands

Here are some postfix queue management commands that I find myself using regularly (on an Ubuntu server):

• mailq: Check the current postfix queue.
• postcat -q 8523E2FA336F: View message stuck in queue with ID 8523E2FA336F. The ID can be found in the mailq output.
• postqueue -f: Flush the queue; Force postfix to attempt sending the mail immediately instead of waiting for a while.
• postsuper -d 8523E2FA336F: Delete message in queue with ID 8523E2FA336F. The ID can be found in the mailq output.