Mail forwarding
（重定向自Mail forwarding service）
Post offices and other mail service providers typically offer a mail forwarding service, commonly known as hybrid mail or virtual post office box services, to redirect mail destined for one location to another – usually for a given period. In the case of the United States Postal Service's First Class Mail it is generally for a period of one year. British Royal Mail provides a service called Mail Redirection, enabling redirection for up to two years. Customers of such a service usually, but not exclusively, use mail-forwarding when they change addresses.