[issue39771] EmailMessage.add_header doesn't work

[hwgdb Smith]

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

https://litmus.com/blog/infographic-the-2019-email-client-market-share

And there is a survey about email client market share. You see outlook is top 3.

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