I am trying to get Windows 10 Mail work correctly with BT (Not Yahoo) email. The inbox folder in the client will synchronise properly with BT mail, as will the Sent Items, Trash and Spam folders. However, none of the folders I have specifically created on the server will synchronise with Win 10 Mail at all. This clearly limits the usefulness of the client!
Any comments on how to resolve this problem would be much appreciated.