Please also see the bug report of this issue in src:kio here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914211 If you consider fixing this in stretch please also have a look at this bug report about adding TLSv1.2 support for smtp connections to kde4libs in stretch: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=891254
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