1.3.3.1 System Queues

A queue manager has a set of built-in queues called system queues. System queues include the following types of queues:

Dead-Letter Queues: Contain messages that were sent from a host with a request for negative source journaling and could not be delivered. Dead-letter queues can be implemented as transactional or nontransactional.

Connector Queues: Temporary locations to store messages that are forwarded to foreign messaging systems. Typically, a connector service running on a server waits for messages to arrive in one or more connector queues and forwards them to the foreign messaging systems. A connector service is application-defined and is not specified by this protocol.

Journal Queues: Contain copies of the messages sent from hosts when positive source journaling is requested by message queuing applications.

OrderAck Queue: An order queue that is used by the message transfer protocols to implement exactly-once delivery assurance.