Hello dawnsh, thanks for your reply but have had no luck I'm afraid.
I deleted my account and tried to set up a new one with recent infront of my username but it wouldn't validate settings and I got the message "couldn't finish, your username or password is incorrect"
Also I do not have "delete email from server" option, only" confirm before deleting"(which I have ticked) and "swipe to delete "(which I've tried both with tick and untick) .
I am only thankful that my emails on main computer are arriving and staying put as usual.
Regards Caro.