I wonder if I can use stunnel to keep using Outlook for Mac 2011.

I have Outlook running on a Macbook with Mac OS 10.9.5 (the latest version possible).

I can use Outlook in this way because my ISP currently supports TLS 1.0--but that support will soon end, when my ISP migrates its mail servers to TLS 1.2. At that point, my Macbook no longer use Outlook or any similar e-mail client.

Is it possible for me to use stunnel so that my Macbook's old Outlook client will work with TLS 1.2?