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It may be possible to exclude the aforementioned forms from searches by adding exclusion criteria to the search. The exclusion criteria would be some word or words that are common in the emails above.
For example, the body or content may contain "Delivery Failure Report" for NonDelivery Report (NDR). To exclude such items, add to the search criteria a new line to use that phrase to detect items to be excluded. That line would be
-"Delivery Failure Report"
Other examples for excluding items could be as follow:

For example this criteria will find all messages that have the word 'Delivery Failure Report' anywhere in the message body and exclude that item from being included in the review set.
Multiple exclusion lines can be added to any search criteria if there are NDR messages that have different formats and terminology to be excluded.
Care must be taken when determining the exclusion criteria as items that are needed for review may be excluded if they contain the words used in the exclusion line.
This issue is caused by those Domino forms having a blank subject.
This issue has been addressed in the following release:
Enterprise Vault 12.3.2
https://www.veritas.com/docs/100043310
Cannot retrieve item. An internal failure occurred. Internal Error: 'Unspecified error (0x80004005)'