Postfix Email Queue Commands

To flush mail queue under Sendmail MTA
sendmail -q

postfix flush

OR

postfix -f

To see mail queue, enter:
mailq

To remove all mail from the queue, enter:
postsuper -d ALL

To remove all mails in the deferred queue, enter:
postsuper -d ALL deferred

Display number of messages in linux mail queue
mailq | tail -n 1

If you just want to know the number of messages sitting in the deferred queue, then the following should get you a quick answer:

find /var/spool/postfix/deferred -type f | wc -l
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