Incident not created through Email

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When user sends email from a particular email address, Service cloud is not creating Incident. We checked in the "Incoming Email Filter" report and found that it is getting rejected due to Workflow Rules. But we are unable to find a rule which is actually stopping this from happening.

Is there a way to find which rule has got triggered for this transaction.

Also, Except for "Do Not Create Incident" condition, can there be any other possible condition can make the Incident stop from getting created.

Thanks In Advance

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