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With the high speed development of computer networks, the amount of information transfer between people is increasing and the transmission time becomes shorter and shorter. In this computer technology and the Internet widely available era, E-mail plays a very important role .By e-mail people can asynchronously transfer text, pictures, video, voice, data files, etc. However, e-mail system client (Mailbox) is an e-mail client software similar to Microsoft’s Outlook Express and domestic Fox Mail. Its design and implementation followed the Simple Mail Transfer Protocol and Post Office Protocol. The main purpose of this design is to achieve a unified user management of multiple mailboxes, improve the e-mail receiving and sending speed, analysis and management of e-mail, administrative contact and receive e-mail in real time and other functions. The design is based on Microsoft Visual Studio 2008 as the development environment, SqlServer2000 as a background database, combined with the open source components LumiSoft.Net.dll mail protocol developed by C# informs. Its design and implementation strictly abide by the software development process, including feasibility studies, requirement analysis, general design, and detailed design and testing. Contrast Web mail, Mailbox has good maneuverability, style-friendly interface and faster processing speed, enabling users to unified management of multiple email accounts, support for offline edit, modify, and read messages, allowing users quicker and more convenient for mail management. Use e-mail client software, landing page content without downloading sites, faster; using the client software has been received and sent through the mail are stored in your computer without Internet access can read the old messages and management. At the same time multi-user, multi-mailbox accounts, and more POP3 support, mail management faster and easier. This paper describes the system with simple, easy to operate, at any time expansion characteristics. After the actual testing and use of proven, the system has good usability.
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