【摘要】 电子邮件（E－Mail是一种通过计算机网络与其他用户进行联络的快速、简便、高效、廉价的现代化通信手段。文章重．点介绍了王种电子邮件的系统架构：基于企业内部局域网的系统架构，基于国际互连网的系统架构，综合局域网和互连网的系统架构。另外，对InternetE－mail的信件格式、邮件传输协议及邮局协议也进行了阐述。更多还原

【Abstract】 E - tal (Electronic Mail ) is a fast, convenience, effective and cheap modern communication tool over computer network. This Paper ietroduces three kunds of E - Mail system architecture:the first is based on enterprise intemal local area network (LAN), the second is based on the Internet, the third is miXed architecture, which integrates LAN with Internet. In this paper, we also introduce the communication protocols related to Internet E-Mail,such as RFC822, MIME, SMIP and P0P3.更多还原