Display the queue of emails to be sent
mailq command The user displays the mail queue to be sent. Each item displayed includes the mail queue id, mail size, queue joining time, mail sender and recipient. If the email has not been delivered after the last attempt, the reason for delivery failure is displayed.
mailq(option)
-v: Display detailed information.
[root@localhost ~]# mailq -v
/var/spool/mqueue is empty
Total requests: 0