[3.12] gh-86650: Fix IndexError when parse emails with invalid Message-ID (GH-117934) #117965
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In particularly, one-off addresses generated by Microsoft Outlook:
https://learn.microsoft.com/en-us/office/client-developer/outlook/mapi/one-off-addresses
(cherry picked from commit f74e512)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com
Co-authored-by: fsc-eriker 72394365+fsc-eriker@users.noreply.github.com