Wonder if it's doing something while it's loading? Should I be suspicious that someone I know who's sending me emails are slow to open and show text and leave when sent when I receive on my iPhone 5S, as opposed to all others which load straight away? What could cause that and is it something dubious at their end? Soon as I mentioned it to them, it was then rectified. Can someone plant something or is it maybe a delivery report type thing? Any help appreciated. I could understand if they were all doing it and it was slow. Then it's the server. But when just from one person I'm suspicious. How can I check?