Thanks for that, DSSmobile.
That answers the 'delete' question perfectly.
That's a function that I may have seen before, but I certainly had not remembered it!
But, is it possible to select multiple e-mails, in order to mark them as 'read' ?
On a previous device (not a Samsung), there was a 'shift' key, that allowed you to select more than one e-mail. If you know what I mean?