My e-mail messages stopped syncing around late 2019. I tried changing my Android app from the default to the xFinity Connect App. Now it is Jan. 2020 and still not syncing. My messages are set to download when I open Thunderbird on my laptop. But I am seeing the old messages on my Android tablets, even though they should have been removed from the server when I viewed them on my laptop. This worked fine for years until recently. Also I could no longer send mail from Android app. Can send from xFin app, but cannot see SENT folder.