Louis Garrel fan mail address, possibility of an autograph

I apologize first of all not being able to communicate in French, considering all the French films I love. Apologies also if I've gotten the wrong forum. Not understanding French I really didn't know where to put my question,

which is this:

Can anyone tell me where Louis Garrel gets his fan mail. The only contact information I've been able to find is his agent's address. I've emailed the gentlemen twice asking him where I might write to Louis and if it would be possible to have him sign a photo. I've never gotte a reply.

...which means I have absolutely no where to send Louis a letter,

SO,
can anyone anywhere help me out and let me know if he has a fan mail address? or if there is anywhere else I might write to him.

This would be so appreciated.

Very sincerely,
Frederick Schrader
New York City