Which TLS version for SDP+?

Which TLS version for SDP+?

We use Office 365 for our email, including mail sent to/from our SDP+. Microsoft is going to disable support for mail on < TLS1.2 in a few weeks. Our mail server settings are to use TLS, but it doesn't indicate what version it uses. Is this something that is managed through SDP, or does it depend on the server on which it's hosted? If the former, how do we know what version it uses, and how can it be updated to 1.2 if it's not?
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