The message is placed on the queue1 queue. If you go to the MSMQ Explorer quickly, you can see the MyLabel message on queue1. Right click on the message and select Properties. You will be able to see that queue3 is the administration queue for this message and that queue2 is the response queue.

After a few seconds, the message disappears from the queue. Because it was not received in 50 seconds, as specified in PROPID_M_TIME_TO_BE_RECEIVED, MSMQ will put the message onto the Xact Dead Letter queue. The queue1 destination queue is transactional. If you right-click on this message in the Xact Dead Letter queue, the value of class property is Time to be received expired.

Because the administration queue has been specified, a copy of the MyLabel message will also be placed on the queue3 administration queue.