bpo-34155: Dont parse domains containing @ (GH-13079)
Before:
>>> email.message_from_string('From: a@malicious.org@important.com', policy=email.policy.default)['from'].addresses
(Address(display_name='', username='a', domain='malicious.org'),)
>>> parseaddr('a@malicious.org@important.com')
('', 'a@malicious.org')
After:
>>> email.message_from_string('From: a@malicious.org@important.com', policy=email.policy.default)['from'].addresses
(Address(display_name='', username='', domain=''),)
>>> parseaddr('a@malicious.org@important.com')
('', 'a@')
https://bugs.python.org/issue34155
8cb65d1381