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

[Stéphane Wirtel]

Stéphane Wirtel added the comment:

David,

do you have an example, I am at the CPython sprint in Dublin, and I think I can work on this issue.

Thanks

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nosy: +matrixise

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<http://bugs.python.org/issue21991>
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