Article 503-1 of the French Code of Criminal Procedure
When he is free, an accused person who lodges an appeal must declare his personal address. He may, however, substitute the address of a third party responsible for receiving the summonses, rectifications and notifications intended for him if he produces the latter’s agreement. This declaration shall be made by the defendant’s lawyer if it is the defendant who is lodging the appeal. Failing such a declaration, the defendant’s declared address…