They include electronic data interchange, electronic payment devices, electronic order system, E-mail, electronic notice system, network, fax and intelligence card, and so forth.

This paper essentially discusses the technical problems and advantages in application of Domain Name System and Mail System in the network construction of the Information Center of Guangdong Province.

Electronic mail system (EMS) is envisioned to work in a computer network for message forwarding, receipt and management, it is a sophisticated communication facility in office automation.