Well, I tried. And got this response:
550 5.2.1 The email account that you tried to reach is disabled. Learn more at https://support.google.com/mail/?p=DisabledUser b9sor2287059lff.39 - gsmtp
Either something went wrong with your email server or it's time to update introduction campaign

Also references to "demo" are weird cause I've already bought the game.