Most forms asking for an email address use the same field name (or one of a limited number of field names), so the browser remembers what you typed last time, a

Most forms asking for an email address use the same field name (or one of a limited number of field names), so the browser remembers what you typed last time, and it'll suggest it to you in a pop-up for autocompletion. All it takes is to type one letter, press down, and enter. Not a lot of chance of mistyping, there;