thanks. that´s true. i tried it myself a few times. worked fine.
the last two multiple request came from an android and an ie10.0
so i guess some people just keep hitting the back and then the send button %-/ because the prompt that "your message has been send" might b out of the screen for some/most people...
does anybody know a more fancy good working form that does a layover prompt of this message or something?!