A message exit can be used only on a message channel, not on an MQI channel. It has access to both the transmission queue header, MQXQH, which includes the embedded message descriptor, and the application data in a message. It can modify the contents of the message and change its length. A message exit can be used for any purpose that requires access to the whole message rather than a portion of it.
Message exits can be used to provide the security services described in the following sections.
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