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随着Ｅ－ｍａｉｌ在Ｉｎｔｅｒｎｅｔ上的广泛应用，其安全性越来越受到关注。电子邮件的安全问题，主要可以分为两个方面，即邮件内容的安全（Ｍｅｓｓａｇｅ Ｓｅｃｕｒｉｔｙ）和邮件传输的安全（ＴｒａｎｓｍｉｓｓｉｏｎＳｅｃｕｒｉｔｙ）。从这两个方面着手，研究电子邮件安全体系的相关技术，并对它作分析比较，最后结合实验结果，给出了一个可行的安金电子邮件系统的设计框架。
As E-mail is widely used on the Internet, its security is getting more and more attention. E-mail security issues, mainly can be divided into two aspects, namely the message content security (Message Security) and mail transmission security (TransmissionSecurity). From these two aspects, we study the related technology of E-mail security system and analyze and compare it. Finally, we design a feasible framework of E-mail system based on the experimental results.