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本文介绍了Win95，WinNT下基于SMTP／POP3协议的E－Mail服务器的设计与实现。首先介绍了Internet电子邮件的组成部分，用户代理（UA）和报文传输代理（MTA）的概念，以及它们在Internet电子邮件中的作用，给出了典型的SMTP／POP3客户／服务器的组成。其次，简单地介绍了简单邮件传输协议（SMTP）和邮局协议（POP3）的工作原理、特点。接下来，给出了实现的邮局服务器的系统功能、系统框架图和运行流程、以及主要功能的实现原理，详细地介绍了有关的数据结构。最后给出了系统的改进和升级的一些设想。
This article describes the Win95, WinNT SMTP / POP3 protocol based on the E-Mail server design and implementation. First, we introduce the components of Internet e-mail, the concepts of user agent (UA) and message transfer agent (MTA), and their role in Internet e-mail, and give out the typical composition of SMTP / POP3 client / server. Secondly, it briefly introduces the working principle and characteristics of Simple Mail Transfer Protocol (SMTP) and Post Office Protocol (POP3). Next, given the realization of the post office server system functions, system framework and operating procedures, and the realization of the main functions of the principle, a detailed introduction to the data structure. Finally, some ideas of system improvement and upgrading are given.