well first of all, I don't think he sends out any authentic autographs -- just pre prints. but to better your chances you could send a self addressed stamped envelope. I never send those, though. I'm still waiting on a reply to my Johnny Depp letter.

edit: or to better your chances of getting an authentic autograph you could send him your own picture (of him) and ask for it to be signed.

My name is Suzy and I wanted to know how you send letters and get Johnny Depp autographs thats all I wanted to know I got the adderess to that but I just want some tips on how to get one?