It used to be easy to change the default email client. In IOS 10 I can see no way to do this. Am I missing something? I can of course remove the apple mail app, and replace with something which suits my purposes better. But if I then use mailto: from a web site, IOS asks me to reinstall apple's mail client. It seems to me, ridiculous that we can remove apple's mail client, but not replace it with something which does the job completely. On that basis, I assume I'm missing something? Can anyone help?