In general If the drugs cross state lines or are placed in the US Mail, then it becomes a matter under federal jurisdiction. It should be a federal offense because the U.S. postal service was used to ship an illegal substance. The postal service is a federal entity. Yes, even if he is the receiver he can be charged with trafficking in illegal drugs and using the US Mail to further the criminal activity. There are multiple ways the charged could be filed though, depending upon the prosecutor. The crimes can be charged in either or both State and Federal courts.