large numbers of my emails have disappeared. I have changed nothing. Are Verizon's servers mis-marking items?
I've had the same problem, if you select emails and click on Delete or Spam, it moves the wrong messages to the Trash and SpamDetector folders. Check those folders for your missing emails. If you need to delete or mark as spam multiple messages, use the Move To button and it will move the correct messages.
No. They're just plain gone. My only hope is if the servers keeps a backup copy.