[issue39771] EmailMessage.add_header doesn't work

[Andrei Daraschenka]

Andrei Daraschenka <dorosch.github.io at yandex.ru> added the comment:

Hello, could you please attach minimal-work file for reproduce it?

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nosy: +dorosch

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