Of course holomail didn't work - it's a free e-mail address. (:
ISP, school, work, and private domain e-mail addresses are accepted. Most internet service providers offer e-mail accounts to their users, so you should have access to that if not to any of the others.
If for some reason you don't, you're welcome to borrow an ISP mail from a friend or family member, or just have them forward you the password, since you only need to use that e-mail address once. After you've got an account you can log in and change your e-mail address to a free one which will be used for subsequent communication.