The Weakness of the Internet Mail System and a Proposal of N ew Mail Transfer Agent

摘要

This paper presents a framework of implementing Mail Transfer Agent(MTA) for Small office/Home office and aims at the improvement of the security of e-mail server. We simplify the setting file of our MTA to reduce setting errors， because difficult settings cause setting errors and occur security holes. This MTA has limits relaying function of mails in order to prohibit SPAM mail relay. And we limit a size of received mail for the counter measures of mail bomb. Experimental results indicate that， this MTA has high security. And the MTA was evaluated that the settings of the MTA are very easy， and that this MTA is convenient in spite of the minimum functions.