I don't know what happened but this crippled by Windows 10 Mail app. I have stopped using SD Cut The Line. I thought it was permanently crippled but I un-did every option and re-booted. It's working now kind of. I receive mail but I get a message box saying cannot get a connection or something with an error code.
Unless I missed something you guys should probably go back through and find what causes this and fix it pronto.