When I register, an error saying “mail address is invalid” appears, and registration fails. Morisawa July 26, 2016 11:18 Updated Check your mail address. You cannot use a mail address of mobile phones of any carriers. Related articles I cannot receive e-mail from TypeSquare. I can't login to TypeSquare's member website. How long will it take to start using the service after signup? What procedure is necessary to quit the service?