Bug#908649: kmail2: kmail - TLS negotiation was unsuccessful
I suppose, the problem is that openssl minimum protocoll version changed
to 1.2 and your mail server supports only 1.0.
You could probably restore the old version by changing the last section
of /etc/sll/openssl.cnf from
[system_default_sect]
MinProtocol = TLSv1.2
CipherString = DEFAULT@SECLEVEL=2
to
[system_default_sect]
MinProtocol = TLSv1.2
CipherString = DEFAULT@SECLEVEL=1
Perhaps you need to change the MinProtocol line to
MinProtocol = TLSv1.0
Reinhard
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