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To clear all messages from the queue the first step is you must shut down qmail. Here are the SSH commands for that.

• Using qmail-rocks scripts:
  /etc/rc.d/qmail stop
• Or you can try the following
  qmailctl stop
• Or you can try this
  init.d/qmail stop

To clear the qmail queue, use the following SSH commands to change to the queue directory and clear the queue.

• cd /var/qmail/queue
• find intd todo local remote mess info bounce -type f -print |xargs rm

After it’s clear you can start qmail back up using a similar command that stopped the service, but say start.

• Using qmail-rocks scripts:
  /etc/rc.d/qmail start
• Or you can try the following
  qmailctl start
• Or you can try this
  init.d/qmail start

Now the queue should be empty!

For learning the ins and outs of Qmail I recommend this Qmail book