Dead-letter queue

You are recommended to set up a dead-letter queue for each queue manager that has a broker running on it. This enables the broker to continue operating when problems are encountered, such as a subscriber's queue being full. In this case publications for that subscriber are put to the dead-letter queue, and the broker continues to process publish command messages.

Without a dead-letter queue you might also have problems if you want to delete that broker from the network (see Deleting a broker from the network).