Eh, when I passed the SE exam, I put SE after my name on business cards, email signature, etc. because I passed the SE exam. I worked too hard on passing that exam that two letters after my name is OK in my opinion. Hard for me to believe that someone would get too bent out of shape about it. Passing the SE exam would make someone an SE, whether or not a particular state recognizes that title or not. Just my 2 cents. But to play by the rules I guess you should get an SE license from a state that has it. I got my SE in IL. I was pretty easy. Just have your ducks in a row.