Date: 2014mar5 Product: postfix Keywords: remove, purge, stuck, defer, defered Q. Postfix: delete mail that isn't getting through A. Here is the command:

/usr/sbin/postsuper -d ALL deferred

According the qmgr man page deferred mail is:

Mail that could not be delivered upon the first attempt. The queue manager implements exponential backoff by doubling the time between delivery attempts.

So be careful. Maybe there is mail in the deferred queue that has only been there a short time that will soon get through. eg graylisting.