Sending him a fan letter?

i found some adresses where is able to send him a fan letter,but..there is that,if you would like a unique autograph then you can write himself,but i don´t understand where i can found his own adress,not the ones that are going to someone else,and they send back fake autograph,
please can someone contact me,who have the same idea to write to him,i need some help :)