Click the queue that contains the messages that you want to delete.
Determine whether there are messages to delete:
If There are no matching messages queued is displayed in the details pane, there are no messages to delete.
If Enumerate message from the queue node is displayed in the details pane, continue to the next step.
With the queue selected, click Custom Filter on the Action menu.
In the Select the Action list, click either Delete (send NDR) or Delete (no NDR), as applicable.
Set other options in this dialog box to meet all the criteria of the messages that you want to delete, then click OK.
NOTE: The default settings of the delete actions are set to delete all messages with a size greater than 0 kilobytes (KB) that are older than 0 days and 0.00 hours and minutes. Make sure that you modify these default settings unless you want all the messages in a queue deleted.