Author Henning.von.Bargen
Recipients Eric Lafontaine, Henning.von.Bargen, maciej.szulik, r.david.murray
Date 2016-12-16.16:00:08
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OK, I understand the arguments. 
If I understand correctly, this will be fixed in one way or another in Python 3.6 or 3.7.
For Python 2.7, this will not be fixed (so I have to work around this somehow, should be quite easy).
I think that at least the documentation and the examples for smtplib should be updated.

The doc should make it clear that the message is passed "as-is" and it's the caller's reponsibility to create a valid message string.

The examples at should note which header fields are required by RFC 5322 and provide an example.
Date User Action Args
2016-12-16 16:00:08Henning.von.Bargensetrecipients: + Henning.von.Bargen, r.david.murray, maciej.szulik, Eric Lafontaine
2016-12-16 16:00:08Henning.von.Bargensetmessageid: <>
2016-12-16 16:00:08Henning.von.Bargenlinkissue28879 messages
2016-12-16 16:00:08Henning.von.Bargencreate