The extension point DeliveryFailureMessageReceivedEventListener is a java interface that can be implemented by CorePlugins to be notified if a new delivery failure message for a sent ticket is going to be processed. It is also possible to change the processing of the delivery failure message in the novomind iAGENT system.
Your plugin receives a DeliveryFailureMessageReceivedEvent that provides additional information about the delivery failure message. The id of the sent ticket belonging to the delivery failure message may also be available, if the sent ticket could be found by the novomind iAGENT system.
Your plugin returns a DeliveryFailureMessageReceivedResult as a result. In the result a DeliveryFailureAction can be set. If it is set, the processing of delivery failure message can be changed. Please see the java documentation for detailed information.