[3.12] gh-86650: Fix IndexError when parse emails with invalid Message-ID (GH-117934) (GH-117965)

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 f74e51229c83e3265f905dc15283bfe0ec1a659e)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: fsc-eriker <72394365+fsc-eriker@users.noreply.github.com>