IOS 10.0.2 Answered
I received IOS 10.0.2 overnight for my iPhone 6. I notice when using my mobile to share an instructable via email, the message window opens and I hit 'Send'. However the window stays open, and acts as though no button has been pressed. I hit send a few more times, with nothing happening, then tried to cancel. I saved my message as draft, but the window remained open. I then chose to delete the message...and the window stayed open. The only way out of this window was to kill the app.
I then had a bunch of messages arrive in my destination email...so all of the messages were correctly sent.
It seems that the app needs an update to close the message window once an action (send, save as draft or cancel) is pressed.