How to report on undeliverable emails

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I'm looking to get a report together that shows me all outbound emails that have come up as undeliverable in the audit log.  This is only the emails that have gone out as part of a response to an incident (not as part of any outbound marketing activity).

Is this possible?  I can't find any way of using this as a report filter from the database dictionary or within the incident fields on the report itself.

Any ideas greatly appreciated!

Paul