[issue10839] email module should not allow some header field repetitions

[Berker Peksag]

Berker Peksag added the comment:

The API in Python 3 is very different and I'm not sure we can backport the expected behavior without breaking other people's code (unless we treat this as a security issue). Here is a naive backport for 2.7.

Known test failures: test_get_all, test_get_decoded_uu_payload, test_multipart_no_boundary

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nosy: +berker.peksag
Added file: http://bugs.python.org/file43357/issue10839_27.diff

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