Display the mail queue
The mailq command displays a list of messages that are waiting to be sent. Each entry includes the queue ID, size, arrival time, sender, and recipients. If a message failed to be delivered during the last attempt, the reason for the failure is also shown.
mailq [OPTION]
-v: Display detailed information.
[root@localhost ~]# mailq -v
/var/spool/mqueue is empty
Total requests: 0