Mobile Multimedia Mail System Application Security Research,

Mobile Multimedia E-mail is a fire-new system, between internet and mobile network. As a round-the-clock working telecom product, it is more important to filter spams and discover the denial of service by recerving a mass of junk mails than common mail system.This paper firstly lists steps of attacking to mail system by sending a great deal of spams with load-testing tools. Secondly, draws an original curve on SMTP connections, referencing to China Unicom business model of MME, and then designs a warning prototype. At the last, brings out a new anti-spams model working on SMTP session layer, based on the prototype and the principle of sniffer.On the model, the host with a sniffer module is responsible of establishing and modifying most anti-spam rules, and updateing these rules to persistent media where the received-SMTP hosts will update from independently and concurrently. The model makes received-SMTP hosts work more efficiently, and makes the system detect and resist junk mails' distributed denial of service partly.