Date: 2021oct16 Product: postfix Keywords: message, stuck Q. Postfix: View queued item A. As root, list the queue with:

mailq

Example output:

-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient------- 849AD14101F 1830 Tue Oct 12 08:44:56 sender@example.com (host mp-mx10.example.com[111.222.333.444] said: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [555.666.777.888] (in reply to RCPT TO command)) recip@example.com -- 1 Kbytes in 1 Request.

Note the queue-id if the item you want to look at and do:

postcat -vq <queue-id>