If you click "view original", it will show you the raw contents of the email. Can you identify what it is from there? If not, if you can attach the output here (or send it to me privately), I may be able to tell you.
For clarity, these messages are related to "feedback loop" emails that were forwarded (by Amazon SES) back to the bounce email. These aren't bounce indications, but there's a suggestion for handling them here: