Don't worry, it's like many "cute" restrictions -- they didn't do a good job. Just capitalize your email and it'll sail right through. It's also only checked on registration, so you can continue to use the lowercased version to login.

It's without the tiniest sense of irony one will observe the "Signin with Google" button on the login form, too :-/

ed: although I may have ruined it for everyone, since my "team name" is now "GMAIL.COM" :-P

      "team": {
        "id": 29,
        "name": "GMAIL.COM",
        "tier": "Free"
      }

Thanks for testing Matthew, I saw you were trying to test the XSS attack as well :) We will consider allowing sign in with personal accounts at a later stage.

Sorry about that! But its actually the registration for signup and not for updates. Thats why we had to block personal emails.