System.ServiceModel 4.0.0.0 System.Enum You can get the property to determine why a message failed delivery and was sent to the dead-letter queue. For additional information about message processing in a dead-letter queue, see Using Dead-Letter Queues to Handle Message Transfer Failures. Specifies the possible types of delivery failure for a message read from the queue. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The sender does not have access rights to place messages in the destination queue. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The destination queue was not found. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The destination queue manager cannot decrypt the message. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The destination queue manager cannot authenticate the message because the attached signature is invalid. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The source queue manager cannot encrypt the message. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The message hop count was exceeded, which indicates the number of intermediate servers. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure A nontransactional message was sent to a transactional queue. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure A transactional message was sent to a nontransactional queue. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The message was purged before reaching the destination queue. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The destination queue was deleted before the message could be delivered to the application. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The message was not delivered because the destination queue is full. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The queue was purged and the message no longer exists. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The message did not reach the destination queue before timing out. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure The message was not delivered to the application on time. Field 4.0.0.0 System.ServiceModel.Channels.DeliveryFailure An unknown error occurred.