Express Mail Service
Besides four classes of mail, there are two other kinds. Express mail is a high speed inter-city delivery system. This kind of mail will be delivered to the destination faster than a regular mail. The cost is surely more expensive. The other is a special delivery called EMS (Express Mail Service). It is used to hasten the delivery as soon as possible after it arrives at the destination post office in town. It usually assures delivery on the received day at the office. The cost is much higher than a regular express mail.