Erik Quaeghebeur <pyt...@equaeghe.nospammail.net> added the comment:

We also shouldn't forget Resent-Message-Id.

So in the header registry 
<https://github.com/python/cpython/blob/2a9f709ba23c8f6aa2bed821aacc4e7baecde383/Lib/email/headerregistry.py#L562>,

'message-id': MessageIDHeader,

should be replaced by

'message-id': UniqueSingleMessageIDHeader,
'resent-message-id': SingleMessageIDHeader,
'in-reply-to': UniqueMessageIDHeader,
'references': UniqueMessageIDHeader,

with Unique/Single used as for the other Headers.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41553>
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