New email service HEY claims to have a fresh take on email, tackling some of the problems many face with an overloaded inbox. But the product has got plenty of attention, partly because of Apple and HEYs developers getting into a very public ding-dong about whether their iOS app was breaking the App Stores rules or not. It looks like that kerfuffle has helped drive even more interest in HEY, and encouraged more people to sign-up to the waiting list.”]