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5.7.1 Delivery not authorized, message refused ##Exchange 2007

navin_peddi asked
Last Modified: 2012-05-09

one of our user send a mail to group of receipients but he received an error "5.7.1 Delivery not authorized, message refused ##" from HUB transport server. I checked it in message tracking tool and the Event ID is showing as FAIL. I also check his storage quota limits. They are fine. What seems to be the issue.
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