Make a letterhead with a bunch of last names on the top "Jackson, Firth, & John" and send the letter. Don't write that it is LLP or office of law or anything as

Make a letterhead with a bunch of last names on the top "Jackson, Firth, & John" and send the letter. Don't write that it is LLP or office of law or anything as that can be misrepresenting, but just make them think that it could be real...