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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 77082b818676 by R David Murray in branch 'default':
#20476: use EmailMessage as factory if non-compat32 policy is used.
http://hg.python.org/cpython/rev/77082b818676

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nosy: +python-dev

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