I think you are getting confused between the versions of TLS. I see no evidence that SmarterMail can utilize anything other than TLS v1.0.
As I said, PCI 3.1 mandates the use of TLS 1.1/1.2 so where we are running control panel based servers with websites and mail on the same box, we will break SM if we are in compliance.
This isn't some future problem, sites with TLS v1.0 still enabled are failing PCI compliance scans NOW, and while there is a year for implementation that's only granted after submitting a detailed formal risk mitigation and migration plan which is not very desirable.