So by now we all know that you can't respond to emails on the Watch. I believe that is due to the limitations of text entry. You have to dictate everything, which is bearable for a text, but not great for an email -- especially since you can't edit what you've dictated to fix mistakes. However, one thing that surprised me is that the watch can't display some emails at all. Now, some messages using formatting that the watch can't display will show a message saying as much, but they will still show a text version of the message. That's fine. What I'm talking about here are the ones that say, "The full version of this message isn't available on Apple Watch. But you can read it on your iPhone." These messages just show who they are from and the subject line, but nothing in the message body. Why is this? I can't seem to figure out what these messages have in common, if anything.