Establishing a Procedure for Handling the Dead-Letter Queue

If an event is recorded in the dead-letter-queue, that indicates a systemic failure that prevented ProfileSync from completing its delivery. If you receive notification that an event has been recorded in the DLQ, you can respond to the notification and ask ProfileSync to try again. Before you do that, however, you should try to determine the cause of the failure and verify that the problem has been resolved. After all, if delivery failed because the target API is unavailable and the target API is still unavailable, then any attempt to retry delivery will also fail.