The queue does not exist “The queue does not exist or you do not have sufficient permissions” If you get the following error with MSMQ it might be that your MSMQ is not correctly installed or that you have not provided the correct permissions when the queues where created.
How MSMQ dead letter queues and poison queues work. Above is the life cycle of a queued message in a transactional queue and the relevant components. I will explain it below.