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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 8375b8d54bf7 by R David Murray in branch 'default':
#20476: Deal with the message_factory circular import differently.
https://hg.python.org/cpython/rev/8375b8d54bf7

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