[issue21991] The new email API should use MappingProxyType instead of returning new dicts.

[Stéphane Wirtel]

Stéphane Wirtel added the comment:

In fact, I am really dubious with my patch because this one is really small and I think there is a missing part somewhere because the description of this issue takes 4 lines and the patch only 2.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21991>
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