I also received the "Salesforce is disabling TLS 1.0 for email" message. I have confirmed that our Salesforce email, both in and outbound, is using TLS 1.2 as indicated this in the header, but email sent from our desktop Outlook 2016, MS Office 365 accounts on MS Exchange (we use Salesforce for Outlook) does not indicate TLS in the header. Is there a TLS requirement for our desktop email programs and if so, how do we determine if our current configuration complies?