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The outbox poller serves two purposes. The first is to process messages from the outbox that do not contain a case ID because they are sent from the process engine. Currently, this only contains process finished messages. The default interval for this poller is 1 minute. The second is to process messages from the outbox that have failed to be sent initially and would otherwise remain in the outbox forever. This outbox poller reads from the outbox table on startup and every 30 minutes by default. 

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