[issue25235] EmailMessage.add_attachment() creates parts with spurious MIME-Version header.

[Kai Groner]

Changes by Kai Groner <kai at gronr.com>:


Added file: http://bugs.python.org/file40578/test_MIME_Version.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25235>
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