一、系统基本构成以计算机网络通信技术为基础的电子信箱系统（PEMS）是一种专门进行电子信件的投递、接受和存贮的公用信息服务新手段。它利用计算机及通信技术，通过分组交换数据网、电话交换网、用户电报交换网及专线，将各用户端机（包括微机、电传机、传江机、交互式终端 First, the basic system configuration Computer network communication technology-based electronic mail system (PEMS) is a specialized electronic mail delivery, acceptance and storage of public information services, new means. It uses computer and communications technology, through the packet-switched data network, telephone switching network, the private switched telephone network and the private line, the client terminal (including microcomputer, fax machine, transmission Jiang machine, interactive terminal