说明：  本论文首先阐述了电子邮件客户端应用程序的开发背景和系统的开发平台，并对系统开发所采用的技术进行相应的介绍。在系统的分析阶段，分析电子邮件的结构和邮件文本格式，介绍电子邮件系统工作原理，并对SMTP和POP3协议进行深入研究。在系统的设计与实现中，确定系统的开发思想以及开发环境。最后给出了系统中模块的详细设计与实现，并对系统模块涉及到的关键源代码进行了详细的分析。
(In this paper, first of all on e-mail client application development and systems background to the development platform, and system development technologies used by the corresponding introduction. The analysis phase in the system, analyzing the structure of e-mail and text messages, e-mail system to introduce the working principle, and SMTP and POP3 protocol to conduct in-depth research. In the system design and implementation, the system s development thinking, as well as development environment. Finally, the system modules for the detailed design and implementation of the system modules related to the key source code for a detailed analysis.)