[issue46392] MessageIDHeader is too strict for message-id

[bpoaugust]

bpoaugust <sebbaz+bpo at gmail.com> added the comment:

The easiest might be for me to provide some test cases, but I have not been able to work out where the existing unit tests are.

One failure which I believe should be permitted under current rules is:

<alphanum at aphanum > - i.e. trailing space
The space gets added AFTER the >

However the following is parsed correctly:

<alphanum@()aphanum > - i.e. trailing space but with previous comment

The obsolete rules I referred to are here:
https://datatracker.ietf.org/doc/html/rfc5322#section-4

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<https://bugs.python.org/issue46392>
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