Tidying up undeliverable messages

 

If you sent a postcard message to John, but never ran a Postcard application with the nickname John, the message would sit on the queue for ever. To prevent this, JMS Postcard sets the Message Lifetime (Expiry) field in the Message Descriptor (MQMD) to 48 hours. After that time, the message is discarded, wherever it may be (possibly even still in transmission).

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