couldn't you just give a bogus email account, like an old hotmail account? It has my real name, and probably plenty of spam waiting to be opened, but that is about it. If airport security says anything against it I can simply say that I do not use email that often. Am I being too naive?
Well, the penalty for disallowing access seems to be a refusal to allow you into the country. I imagine that giving access to a legitimate but old and useless e-mail address would be taken as a refusal, and you'd just get back on your plane and go home.
The people most likely to maintain several "live" email accounts to get through this situation? Those with criminal intent. So once again this is a perfect way to make innocent people (who value their privacy and won't co-operate) look like a security threat.