I am posting this problem again. Hopefully I will make it clearer and not get rude smart *** responses. I have iPad 2. IOS 9.2.1. I use a Verizon POP account for my mail and I spent an hour on the phone with Verizon with no resolution . I have suddenly got 9,999 emails in my INBOX, most of which were deleted a year ago. I delete them all from the INBOX and TRASH and they reappear in the INBOX within a couple of minutes. It also happens with new mail.
iPad