The dead-letter queue is used if the message destination is not valid. WebSphere MQ puts such messages on a local queue called the dead-letter queue. Although having a dead-letter queue is not mandatory, you should regarded it as essential, especially if you are using distributed queuing or one of the WebSphere MQ bridges.
Do not define the dead-letter queue as a shared queue.
If you decide to define a dead-letter queue, you must also tell the queue manager its name. To do this use the ALTER QMGR command, as shown in the sample.
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