Cold E-mail is the same as Cold Calling. The term "cold" is used because you don't have any relationship or formal introduction to the person you are contacting, so you are a stranger to them, so you have a "cold" relationship as opposed to a "warm" relationship with friends or family Example: if you were trying to sell new windows to people, you would get a list of people who live in places with older homes who might need new Windows - you will "cold" call/e-mail these people offering to sell them new Windows and since you haven't met or spoken to them before its considered a "cold" call/e-mail

It is a letter to an unfamiliar person.