[issue43123] email MIME splitting

[Ross Rhodes]

Ross Rhodes <ross.rhodes at hotmail.co.uk> added the comment:

Hi Martin,

Looking into this further, it appears we already catch CR-LF characters in header values, but your test case shows that we do not run the same checks on header names.

I've opened a PR to rectify this - feel free to leave feedback.

Ross

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43123>
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