Traditionally you use the “sendmail -q” command to flush mail queue under Sendmail MTA. Under Postfix MTA, just enter the following command to flush the mail queue:

postfix flush


postfix -f

To see mail queue, enter:


To remove all mail from the queue, enter:

postsuper -d ALL

To remove all mails in the deferred queue, enter:

postsuper -d ALL deferred

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