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

[aj guy]

Changes by aj guy <ftfr4life at aol.com>:


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assignee:  -> docs at python
components: +Documentation, Library (Lib)
nosy: +aj guy, docs at python
type: behavior -> resource usage

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