New submission from Michael Thies <accou...@mhthies.de>:
Email header refolding in email._header_value_parser adds additional carriage return symbols to the end of nested parse trees, when used with an EmailPolicy with linesep='\r\n'. This leads to broken email headers when composing an email with a "To:" or "CC:" header having a comma-separated list of recipients with some of them containing non-ASCII characters in their DisplayName. The bug seems to be caused by the following line (in Python 3.7): `encoded_part = part.fold(policy=policy)[:-1] # strip nl` (email/_header_value_parser.py, line 2629) This line calls part.fold() / _refold_parse_tree() recursively and tries to remove the trailing newline, which is added by the recursive call of _refold_parse_tree(). Unfortunately, it fails to do so, if the length of the policy's line separator sequence does not equal 1. Thus, this line should be corrected to something like `encoded_part = part.fold(policy=policy)[:-len(policy.linesep)] # strip nl` ---------- components: email messages: 328362 nosy: barry, michael.thies, r.david.murray priority: normal severity: normal status: open title: Email header refolding adds additional \r in nested parse trees type: behavior versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue35057> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
