Purge (flush) the PostFix mail queue after deferred, suspended or timed out issues

If you see deferred, suspended, or timedout messages, after you correct the problem (which is typically related to the mailhost in the main.cf or /etc/hosts file, you have to purge the mail queue:

To verify the mailq status issue:

#mailq

To flush the queue:

# postqueue -f

or

# postfix -f

These commands will flush the mail queue and then remove all messages.