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Fix for: CVE-2016-0772 python: smtplib StartTLS stripping attack (rhbz#1303647) Raise an error when STARTTLS fails. - rhbz#1303647: https://bugzilla.redhat.com/show_bug.cgi?id=1303647 - rhbz#1346345: https://bugzilla.redhat.com/show_bug.cgi?id=1346345 - Fixed upstream: https://hg.python.org/cpython/rev/d590114c2394