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

[R. David Murray]

R. David Murray added the comment:

I'm leaving this open and changing the version to 3.5 to remind myself to fix this right once default is open for 3.5 changes.

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stage: commit review -> needs patch
versions: +Python 3.5 -Python 3.4

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<http://bugs.python.org/issue20476>
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