I think Thunderbird will also save a byte-identical copy of the mail, if
you use File | Save... and use ".eml" (for email = RFC822) file extension.
The dialog is sensitive to the file extension and determines the format
based on that, but is unfortunately not communicative about it.
If you save as HTML (.html) or plaintext (.txt), it runs it through the
MIME converters and reformats it for display / human reading.
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