Postfix Mail Queue Commands

You can use the following Postfix mail queue commands.

Queue list view command:

postqueue -j

{"queue_name": "deferred", "queue_id": "0A7A2A0396", "arrival_time": 1589186141, "message_size": 4540, "sender": "***@***.com
", "recipients": [{"address": "***@***.com", "delay_reason": "Host or domain name not found. Name service error for name=***.com type=MX: Host not found, try again"}]}

Clear queue command:

postsuper -d ALL

Command to see the number of emails in the queue:

mailq | grep -c "^[A-F0-9]"

Queue resubmit command:

postqueue -f