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Note that this is the total number of delivery attempts, not re-delivery attempts. When this threshold is reached, the message is permanently removed from the message store, and no further attempts to deliver the message will be made. This is useful when the client application does not acknowledge the message because an operation on the message failed.
If the message is successfully delivered on a redelivery attempt, the JMSRedelivered field is set to true in the message header, allowing the client to determine whether the message was delivered on its original attempt or on a redelivery attempt.