You need an e-mail address in order to apply for anything with us. All of our records are kept via email. We don't care what kind of email address you use, whether its free or otherwise, as long as you have one that you actually check, even if for no other reason than to get our responses to your apps. The address, of course, needs to be in a valid pattern, which usually looks like firstname.lastname@example.org or something like that. Only staffers will know your email address, and we won't give it to anybody else.