[issue5871] email.header.Header too lax with embeded newlines

[Ray.Allen]

Ray.Allen <ysj.ray at gmail.com> added the comment:

Besides, not only the header value, but also the header name can only be printable ascii characters according to RFC2822:

"A field name MUST be composed of printable US-ASCII characters (i.e., characters that have values between 33 and 126, inclusive), except   colon."

But the msg object's __getitem__() seems to accept all ascii characters.

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nosy: +ysj.ray

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<http://bugs.python.org/issue5871>
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