I have deleted all in-box material in iPhone 6+ and email provider server. I have also made sure the email is not beint saved to the iCloud. It does a little better if I delete one at a time, but the delete all key only brings everythihg back after a brief pause or reboot. The phone mail has worked perfectly for two years until this past week. Also the message count on home screen and in list of inbox, junk box, sent, trash, archives do not coincide with the number of emails in each box.