You have entered a wrong email.
This happens about 20% of people who enter email with the keyboard, rather than copying it. Check whether the email. The letter did not come to that, if your email is characterized by at least one symbol.
The letter was put to the spam or blocked by your email program.
Check the 'Spam'. If there is not, check the filters. Otherwise, ask for help to the administration of your mail or change your e-mail (we recommend gmail.com).