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

[Maciej Szulik]

Maciej Szulik added the comment:

I've chatted a bit with David about this feature. Here are some thoughts:
- check what SMTP standard says about some validation rules
- add validate method, probably into email package

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<http://bugs.python.org/issue28879>
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