I have tried all of the above since this happened to me last week-am on latest software update.I have tried reboot ,restore and complete reset using icloud to restore from back up
But I still have same issue but now intermittent- mail will open but sometimes disappears either when opens or when trying to delete mails or after a period of time
Really cannot have this as the need to check emails essential for our small hotel so we do not get rooms double booked
My wife has a 5 with our email account on which is working perfectly -she has not done the latest software update !!!!
Is this a software issue or a fault with my 6 plus as really need to sort this
Thanks in anticipation