With my diary app Remembary, I occasionally get empty emails submitted from the app's "Support Email" button in the help popover. The "?" button, the "Support Email" button, and the popup email's "Send" button are all in the top right part of the screen, so my best guess is that it's people's children tapping repeatedly in the top right area of the iPad. Good thing I don't have anything particularly destructive up there.

So thinking "what about the children?" is a good idea when doing any kind of app layout. It's good to make sure that repeatedly tapping or clicking on one part of the screen doesn't trigger deletions or other dangerous side effects.

In my case, it's nice to get an email every so often that doesn't have any calls to action in it.