[issue39771] EmailMessage.add_header doesn't work

[hwgdb Smith]

hwgdb Smith <hwgdb123 at gmail.com> added the comment:

Microsoft outlook 20116 MSO(16.0.4266.10001) x64
Foxmail 7.2 (build 7.026)

I use these two email client. All display incorrectly. And I have uploaded the screenshot.

----------
Added file: https://bugs.python.org/file48924/foxmail_screenshot.jpeg

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39771>
_______________________________________