34 Pa.C.S. § 2743

To revoke a license then in force or to deny any person the privilege to secure a license or to hunt or take game or wildlife anywhere in this Commonwealth for any period, the commission shall send a written notice to that effect to the person at the last known address by United States Postal Service with provisions for return of a signed receipt or a receipt of nondelivery. The return of an undeliverable notice shall be proof of service and shall not be used as a defense against the denial or revocation of the privilege to secure a license.