(a) All correspondence to an establishment or to a licensee shall be sent to the mailing address of record as reflected on the initial license application or as otherwise provided by the establishment or licensee.(b) Notice shall be deemed complete upon deposit by the Commission in a postpaid, properly addressed envelope. The correspondence must be placed in a post office or official depository under the care and custody of the United States Postal Service, FedEx, UPS or any other over-night mail delivery service.