Most tourist hotels provide postal services. Travelers at the hotel can send postcards, letters and EMS to anywhere in the world at any time. However, the printing, packet and parcel should be sent from the designated post office. Some stores provide such services and they will help the travelers to send what they have bought to anywhere in the world.
If you wish to send important items such as antiques or cultural relics that are under customs control, you will have to ask for the assistance of the local branch of the international post office, instead of the small post office in the hotel.
Fax and email is usually handled in the Business Center of the hotels.
Guangdong Post official website in English: http://eng.183.gd.cn