Depends on your customer base. It might be better to reject one show-off who managed to put a backspace in his email in return for helping 1000s of customers wh

Depends on your customer base. It might be better to reject one show-off who managed to put a backspace in his email in return for helping 1000s of customers who enter www.name@aol.com It's possible to have a 6 character email address, but for most users checking that they have entered more than 6 chars would be good.