Design And Implementation Of Mail Server

Now Email becomes the most important and largest application on internet.Through the e-mail system of the network, the user can at a very low price, very fastway, contact with any corner of the world to the network user. The utility, its highperformance and the requirements of the computer and communication aspects of thelower. Using email has become an important method of between people. Because ofits practicability, high performance and the low require to computer andcommunication.As the development of computer software and hardware and the improve of thecommunications services quality, E-mail system achieves the e-mail, digitaldocuments, images and digital voice, and other types of information delivery. At thesame time, You can get a lot of free press, thematic message, And easily searchinformation, It’s widely applied to people exchanges are a great way to change.This paper briefly introduce the history of e-mail system.First briefly introducesthe research status of e-mail system and its history at home and abroad, to understandcurrent level of development of e-mail technology, and further puts forward the workto be carried out; then the e-mail message structure, the working principle of thesystem, a simple mail transfer protocol and post office protocol are outlined, the emailaddress format, and transmit the user agent, the message transfer agent, mail deliveryprocedures and mail; and then introduces the design and implementation of mailserver, system analysis of the SMTP server and the POP3server, the overall designscheme is proposed for a mail server, and implements the SMTP server and POP3server design the domain name system, function of the realization of access, toachieve function and the mail; finally, the mail server for the design of the system testand points out the insufficiency and improvement, technical analysis of the mailserver, security analysis technology and discusses the development trend of the mailsystem.E-mail on the Internet through the Simple Mail Transfer Protocol to send asimple mail transfer protocol is sent to standardize and the Shuttle of the dialogueprocess between. From the mail server users to retrieve messages, use of post officeprotocol, which provides access to e-mail from the mailbox of a set of standard mechanisms. The subject of the mail server designed to support simple mail transferprotocol agreement with the post office.