Deprecation of TLSv1.0 and TLSv1.1

Which version of TLS is VitalPBX using when I use an external mail server and set TLS to yes?

I tried setting it to Yes and look in /etc/postfix/main.cf but I don’t see anywhere specified the version it is using.

Looking at other postfix config samples, I see that you can add the below:

#Use TLS Version 1.2
smtp_tls_mandatory_protocols = TLSv1.2
#Use TLS Version 1.3
smtp_tls_mandatory_protocols = TLSv1.3

Is this already existing somehow in VitalPBX?