Secure Mail System

With the increasing of activities on the network, the email service is getting more and more important to daily life of its people, especially with the high developing of the Electronic Commerce, more and more sensitive information is transported on the network. The requirement of the security of information urged. Currently, the email services provided by the email service providers can't meet the requirement exactly. Under this condition, we began to work on this subject. What we are going to do is to provide a secure, efficient and enormous user-support security email system solution and implementation. We deeply studied the requirement of the security email and the procedure of the transportation of emails over the network, and give outDuring the period that we worked on this subject, we first studied the status of the current internet email system and the requirement of Security Email in detail, then studied every period that the emails exist on the internet, the threats facing them, and the imaginable applications of the security email in real life. We have read many materials those relate to the security of information transporting on the internet, and we have refer to many Network Information Security Modules and experiences of the other email service providers. Based on all of these, we give out a whole solution from the client side to the server side, we not only provide the confidential service for the email users, but also provide the signature, anti-deny and anti-impose security services. In this solution, what we took into consider is not only the security of emails but also the system's stability, extensibility and efficiency, make full use of the "load balance" and "distribute computing", it makes the system run more smoothly and efficient, and it also reduces the running cost for the email service providers and the development cost for us. Now the system is running on the Internet, it runs smoothly, very stable. And at the end of the thesis, we also give out an improved solution of the current one.