The Research And Implementation Of SMTP Transparent Proxy Server For Security Isolation

With the wider use of e-mail, communication between enterprises and outsideworld become more and more frequent by E-mail which is exchanged through SMTPproxyservers.Peoplefacethesecuritychallenges whilethey enjoythebenefits.Howtoeffectively prevent virus attacks, how to effectively prevent the leakage of secrets, arebecoming more and more attention. It's a very urgent need to establish a safe andreliable mechanism to protect the safe operation of the internal mail system. Networkisolation technologyhasemerged, which effectivelyisolates inside network andoutsidenetwork and ensures security of network data transmission. In this paper, the SMTPtransparent proxy server for security isolation has been studied in-depth, and one ofkeytechnologies-ThreadPool,hasbeenemphasizedon.Firstly, technologies of SMTP transparent proxy server for security isolation wereintroduced. The merits of transparent proxy were analyzed, and then the architecture,constitutionand main function of SMTP transparent proxy server for security isolationwasproposed.Secondly, the paper studied transparent model and the concurrent applicationserver technology in-depth, analyzed the current multithreading technology, thenproposeda new technology of thread pool -- expanded thread pool. Formalanalysis ofthe expanded thread pool, indicated that technology could get higher throughput whilefulfillingtheneedofconcurrentconnections,andgetbetterperformancethantraditionalthreadpooltechnologies.Then, the implementation of transparent proxy server for security isolation wasstudied. The paper discussed emphatically its concrete realization flow, configurationmanagement module, access control module, protocol processing module, contentfilteringmoduleandauditlogmodule.Andaprototypesystemhasbeenimplemented.Finally, the function and performance of the prototype system was tested, andanalyze the results. At the same time, we get further research in the future on theexistingbasis.