The Broker's dead letter queue is the default queue for dead letters. It receives dead letters for all document types. Broker client applications can also create and maintain their own dead-letter queues. For example, an application that submits order documents might maintain a dead letter client to capture order documents for which there are no subscriptions.

The presence of an application-defined dead letter queue does not affect the behavior of the Broker's default dead letter queue. If the Broker receives a dead letter for which there exists an application-defined dead letter queue, it places the document in the application's dead-letter queue and in the default queue.