Research And Optimization Of High Performance Mail Security Gateway

With the continuous growth of Internet traffic, the traditional spam identification technology is difficult to deal with today's high-speed network environment. The traditional technology needs to analyze the content of each message, not only in the analysis of time, but also need a lot of calculation. Based on the demand of high speed network environment, this paper studies and optimizes the key technology of high performance mail gateway. In the same time,a high performance mail gateway system is realized in two aspects. In this paper,we study the email address matching technology and the behavior based spam identification technology.First, this paper focuses on the basis of the mail gateway matching technology, mail address matching technology. The traditional multi pattern matching technology is mainly in the general matching. In the application in the mail address matching, the composition of the email address is not considered, so that the performance will be reduced. So this paper presents a new algorithm for multi pattern matching algorithm, which is based on email address filtering,ACEA algorithm. The author makes a deep research on the characteristics of the e-mail address, which makes the ACEA algorithm not only considers the composition of the email address, but also takes into account the distribution characteristics of the actual email address. At the same time,it is also better than the AC algorithm in time complexity.Second, this paper makes a detailed analysis of the process of sending the e-mail and the SMTP session. In this paper,a spam filtering model based on user behavior classification is proposed in this paper. The model does not need to be completely resolved and filtering the content of the message, but by analyzing the difference of sending behavior of spam and normal users. The model has a good performance in the processing performance of the other spam detection methods. It can be used as an effective outer filter model, with the Bayesian filter, fingerprint filter and other traditional spam filters.In this paper, a high performance mail security gateway is designed and implemented in this paper. The method and process of the system are described, and the function and performance of the system are given. The results show that the mail gateway system has good system throughput and spam recognition accuracy in high speed network environment, and has high practical value.