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Once all attempts at redelivering the message fails then the message is forwarded to the dead letter queue.

OnRedelivery

Available in Camel 1.5.1 onwards

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When Dead Letter Channel is doing redeliver its possible to configure a Processor that is executed just before every redelivery attempt. This can be used for the situations where you need to alter the message before its redelivered. See below for sample.

Redelivery default values

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