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With the rapid development of the Internet, the enterprise's information technology has become one of the basic needs of enterprises in the fierce competition of modern society. E-mail is an important part in the enterprise information system. E-mail as an important means of enterprise information exchange, not only can improve the image of the enterprises, but also in reducing the corporate office expenses, improve enterprise efficiency has a significant effect. SMEs due to their capital, technology and other reasons, are often unable to establish their own E-mail system. This is extremely unfavorable for the SME informatization construction, which hampered the development of small and medium enterprises in virtually. In this paper, a secure e-mail system as the research object to study how open source technology to achieve a secure e-mail system, help for the development of SMEs. First, the article describes the background to the study, analysis and the Mail market prospects do. Then introduced the principles of e-mail, and protocol frequently used in the e-mail system. Then this article is for standard S / MIME email security analysis is introduced, and the encryption algorithm used in the standard. , In the previous work done on the basis of, firstly, a common mail server comparative analysis, and complete the selection of the mail server. Then, using the MVC pattern layered design of the overall architecture of the system, and the principle of a further description of each layer of the design and design. Struts2 structure in which a detailed description, and its application in the system. The completion of the overall design of the system for the functional design of the system were introduced, and which part of the functions carried out a detailed description of the basic analysis of the problems that may be encountered in the function of the realization of the process. In the realization of the system, this paper introduces the realization of the basic functions of the mail system, including a detailed description of complex mail processing incoming messages. Mail filtering, mail server features to achieve a double filter, introduced the extension mechanism in which the mail server. Mail security is a major focus of this article, in this part, the focus of the digital certificate distribution systems, described from both administrators and ordinary users. Security for the message transfer process, the paper also carried a detailed introduction, and discussed how the messages are encrypted. In addition, this paper introduces the testing of the entire system, and the results of tests carried out basic analysis. Finally, a summary of the work done.
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