Wouldn't this be better if you create an app? It's much more efficient too because with email, it's going to be problematic for some people because there's some out there that might not even see the alerts because they've got a really bad notification setting for their emails that it doesn't show to them sometimes, happened to me a while back.
Maybe this is some idea but it would need to have a bigger functionality and run with more exchanges. This leads to big and serious project with lots of options, user accounts etc....and my actual project is very small and simple.