Where do the "Not Delivered" e mails go ?(both)

Over the years I have had several "Not Delivered" e mails.
Are they floating around somewhere? Can someone "Catch" them and use them for sinister purposes?

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Gusman · 61-69, M

The boffins do say, "Once it is out there, it is there forever".
Where is "There" for the undelivered?