Overview Usually when we work with Service Bus queues, after a while, we end up with some messages reaching the corresponding Dead-letter queue, which is nothing but a partition inside that queue to store messages that weren’t successfully processed. The reason for the messages ending up in DLQ could be anything starting from lock-duration issue to max delviery count threshold or even a technical issue. Once we have these messages piled up in DLQ, next action should be try to reprocess.