This seems like good practice to me. It's saved me a few times. If the email is entered incorrectly the user can't log in, you can't contact them, they'll proba

This seems like good practice to me. It's saved me a few times. If the email is entered incorrectly the user can't log in, you can't contact them, they'll probably blame you (as they don't know why they can't login) and never use the site. Asking them to re-enter it is a good way to catch this mistake. The same applies to passwords. This is something I've noticed a lot in mobile apps. Because they know you hate typing on a touch keyboard they don't ask you to re-enter your password. It's bad practice in my opinion and it's something I've noticed in some major apps.