[issue28879] smtplib send_message should add Date header if it is missing, per RFC5322

[Eric Lafontaine]

Eric Lafontaine added the comment:

forgot to re-post the to-do, and to correct the documentation :
List of things to do :
- Implement a patch for the code to add a missing "Date" field if it doesn't exist .   (in review)
- Modify the documentation at the SMTPLib for the send_message to mention that it add missing date using the email.utils.formatdate 
- Modify the comment of the send_message code to mention RFC 5322 in there (ideally with the section of the RFC).  ( in review)
- Modify the example of Python 2 to present a RFC 5322 examples 

Feedback welcome as always!

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Added file: http://bugs.python.org/file45959/issue_28879_V3.patch

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