[docs] [issue20476] If new email policies are used, default message factory should be EmailMessage

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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resolution:  -> fixed
stage: needs patch -> resolved
status: open -> closed
type: resource usage -> enhancement
versions: +Python 3.6 -Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20476>
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