The email address is required only to track how much money you have earned. You will get an email for each image that is approved, although I should probably make that an optional checkbox. You can also go to http://www.fastracecars.com/check-my-earnings.html
to check your earnings at any time by entering your email address. So, other than those 'approved image' emails, you won't receive any email. The goal of the site is to just be an awesome picture/video "car guy" site for people to enjoy. The ads on the site help pay for the server costs, and allow me to give back to the users. The more popular the site gets, the more stuff I'll be giving away.