Kai Groner added the comment:

>From https://tools.ietf.org/html/rfc2045#section-4
>   Note that the MIME-Version header field is required at the top level
>   of a message.  It is not required for each body part of a multipart
>   entity.  It is required for the embedded headers of a body of type
>   "message/rfc822" or "message/partial" if and only if the embedded
>   message is itself claimed to be MIME-conformant.

This patch looks like it avoids adding a MIME-Version header to parts with no 
mime metadata, but it can actually be omitted from most parts.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25235>
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