摘 要
電子郵件是介於書信、電話和傳真之間的電子資訊傳送方式，它也是網際網路上最基本的功能之1。隨著網際網路的進1步發展，電子郵件已經成為人們聯絡溝通的重要手段。技術的革新使得電子郵件系統已經演變成1個相當複雜且功能更為豐富的系統，可以傳送聲音、圖片、圖象、文件等多媒體資訊，以至於資料庫或帳目報告等更加專業化的檔案都可以以電子郵件的形式在網上分發。隨著資訊科技的發展以及電子郵件系統功能的日益強大，其應用領域已得到較大的拓展。基於Web的電子郵件系統應用是這些年發展起來的，網路的普及使得它得以廣泛的應用。採用開放的Web郵件服務不僅為使用者省去了維護與升級客戶端軟體的麻煩，而且也能夠充分發揮系統軟硬體資源的作用。Web郵件服務的另1個優勢是允許使用者甚至是持有移動裝置的使用者，可以隨時、隨地的.訪問系統並進行資訊傳遞。
郵件伺服器主要實現郵件的傳送和接收以及對郵件和使用者的管理。該系統的功能分為3個模組：（1）通訊模組，用來實現郵件在網路中的傳送和接收；（2）使用者模組，用於後臺管理郵件伺服器中的郵件和郵箱，可以刪除、新增郵件和刪除、新增郵箱；（3）系統模組，用來記錄郵件伺服器執行時的狀態。
關鍵詞：電子郵件；B/S；C#；郵件伺服器
Abstract
E-mail is a transfer way of electronic information among letter, telephone and fax. It is also one of the most basic functions on Internet. With the further development of Internet, the e-mail has become the important means of people’s connection and communication. The evolution of e-mail system has become very complicated and abundant by the innovation of technology, can convey multimedia information, such as sound, image, picture, file, etc., More specialized files, such as the data base or the account reports, etc. can all be distributed on the net in the form of E-mail. The e-mail system function is strong day by day with the development of information technology; its application has already got greater expansion. This paper is subject to how to build up email system on base browser to servers of application pattern, and study the relevant technology. The application pattern on the Web has developed these years. Popularization of Internet makes it apply broadly. Adopting open Web mail service, user not only have saved trouble of installing software, but also can fully give play to the role of resource of the software and hardware of system. Another advantage of Web mail service is to allow users, even hold users of mobile devices, can visit system and transfer information everywhere any time.
The main functions of the Mail Server are the realization of mail sending and receiving and the management of mail and users. The functions of the system can be divided into 3 modules: (1) The connection module, which is used to realize the sending and receiving of mail in network. (2) The user module, which can be used to delete, add mail or mailbox, then realize the management of mail and mailbox in the backstage of mail server. (3) The system module, which is used to record the condition of the mail server when it is running.
Keywords: electronic-mail; B/S; C#; Mail Server
