[3.13] gh-80222: Fix email address header folding with long quoted-string (GH-122753) - #129007
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…ing (pythonGH-122753) Email generators using email.policy.default could incorrectly omit the quote ('"') characters from a quoted-string during header refolding, leading to invalid address headers and enabling header spoofing. This change restores the quote characters on a bare-quoted-string as the header is refolded, and escapes backslash and quote chars in the string. (cherry picked from commit 5aaf416) Co-authored-by: Mike Edmunds <medmunds@gmail.com>
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Email generators using email.policy.default could incorrectly omit the
quote ('"') characters from a quoted-string during header refolding,
leading to invalid address headers and enabling header spoofing. This
change restores the quote characters on a bare-quoted-string as the
header is refolded, and escapes backslash and quote chars in the string.
(cherry picked from commit 5aaf416)
Co-authored-by: Mike Edmunds medmunds@gmail.com