Hi Mark,
if GnuPG/Enigmail report "BAD signature" then either was the message tampered with, or (which is more likely), Microsofts Mailing List software broke their own signature. So that's something that you should report to Microsoft (and provide them with the full mail source code as it resides in your inbox now).
The part of your question concerning the ambiguity of which part
is verified by the signature may be related but is an issue that
is not fully solvable by enigmail since parts of that mail would
need to be displayed separately, ultimately leading to a different
Thunderbird UI.
Olav
smime.p7s
Description: S/MIME Cryptographic Signature
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