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Message rejection configuration can be located within the Pre-Processing section of a Project Mapping, configuration will be inherited from the default Project Mapping if it is not overridden.
Configure a Template Set for message rejection notifications:
The template set that is used to generate message rejection notifications can be configured via Project Mapping → Templates → Message Rejected Template Set:
Configure message rejection notifications:
Configure message rejection when issue is in specified status:
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Rejection notification received by the sender of the rejected email: