The first step is to ensure your server has support for TLS 1.2, outgoing, as well as incoming. If you are on a shared server, you should check with your web host. If you have your own server, you will need to check and may have to make registry changes yourself. We found that Windows Server 2008 R2, for example, even with all up-to-date patches on, does not have TLS 1.2 support by default and requires registry changes.
