Since last week I had three instances where I get a single email from only one known sender which downloads like 50 times in the inbox ,sent at same time 04:30 PM. It freezes up when I click on the message . It recovers but am not able to erase as it freezes every time you click on any message from the sender. The sender is using I phone or Apple computer to send this emails There is no problem sending or receiving from any other sender.