Email never sent

Do you ever write an email with the intent of it never being sent? I do. It’s kind of a cathartic process. Sometimes it’s not personal thoughts but a response to someone else’s email and you just think before hitting “send”. I am thinking on setting up a “dead letter office” to send ’em to, that way I can keep them almost as a journal of sorts without the intended recipient knowing my thoughts before they are conjealed…..