Research On Four-layers "total Series-wound And Branch Shunt-wound" Anti-spam Filters System

Along with the Internet's fast development, more and more networks services are popularized in daily life and changing our life way. By the formidable charm of convenient, and low cost's, the email (electronic mail) has become the indispensable important communication mode in the modern life. Meanwhile the advantage of convenient and the low cost, also becomes one causes that the spam e-mail produces, in addition the crack of the email transport protocols, the spam e-mail already become a sedimentation question to the entire Internet, we may say that the e-mail is one most controversy by-product of the Internet to humanity.The existing anti-spam technology may roughly divide to two kinds:"root blocks" and "existence discovers", no matter the "root blocks" or the "existence discovers", has the risk of leak or miscarriage justice, they can not work independently and perfectly. The wisest method is to carries many kinds of anti-spam technology on one filtering system. At present the Anti-spam product mostly uses the layering thought to combine the kinds of anti-spam technology, namely one e-mail must pass each layer in the filtering system, it can pass the system only if no layers evaluate it to spam. Layering system's this characteristic causes the recall rate achieves the quite high level in the layering filtering system; also namely the "leak" spam mail is quite few. But the simple layering system's FP rate is terrible. Also a common conformity model is the jury mechanism, in this mechanism the second layer is designed to be a "jury layer" to carries on the synthesis to the first layer's results. Because it distinguishes each kind of filter's result weight, it also supposed to improve.This article is take the anti-spam filter conformity model as the key research, conducted the research to the email transmission and the receive architecture and main anti-spam's technologies. Through the research to the simple layering system and the jury mechanism system, this article analyzed the shortcoming which they exist, and proposed the new conformity structure--"Total Series-Wound And Branch Shunt-Wound" type conformity plan; Finally this article attempt to use the kinds of mature filtering technology to compose the anti-spam filtering system, then designed a opposite experiment to test the reliability of mailfilter filtering conformity Module and six layers filtering conformity module with the e-mail language materials includes the normal mail and the spam mail. It confirmed the validity of the new conformity model through the experiment.