It does that with some providers, a friend of me had the same problem. The only thing that helped was getting a new (fake) E-Mail adress from a provider iScribble accepts. For me & him that was web.de, but it's a german one and I don't know if you want to use it... Maybe you ask some iScribblers from your country wich provider they use? When you log in as a guest you can use the chat. There should be someone who can help you.