摘 要 电子邮件服务由专门的服务器提供。主要的电子邮件服务器主要有基于Postfix/Se ndmail的邮件系统，也是在企业中使用数量最多的邮件系统。其性能可以达到非常高， 而且安全性很好，同时软件是开源免费的。 本套系统采用B/S模式开发，由服务器端和客户端两部分构成。服务器端除了提供最 基本的收发邮件功能之外，它还具有注册新用户、管理用户、群发邮件等功能。客户端 分为普通用户端和管理员端。普通用户端可实现基本的注册、收发邮件，修改个人资料 等功能，管理员端主要实现群发邮件功能，以方便主管领导发送紧急通知，除此之外， 它还可以实现浏览用户信息以及删除用户等操作。 论文从需求分析、系统设计、详细设计、系统调试与测试等方面对系统的设计过程进 行了详细的描述，并对系统待完善之处提出了建议。 关键词：Linux系统；邮件服务；域名解析；服务器 Abstract E-mail service provided by a dedicated server, but the system of large mail service providers are generally developed or to other technology development and implementation of two times. The e-mail server is a mail system based on Postfix/Sendmail. Use the largest number of mail system in enterprise. mail system based on Postfix/Sendmail is in need of a strong technical force to realize, but performance can reach very high, but very good security, and is open source and free software. This system developed based on Browser / Server module, which contains server and client. This system is constituted with server and webmail.The server provides the basic function that user can use it to send and receive mail.Besides,it also provides other functions such as :registering a new account. managing users' information. sending system message. receive and send a mail, reform person's basic message. The administrator can send many mails one time to send vital notice . In addition, the administrator also can view the users' message and delete a user's account. The papers make a detailed description on the process of system design from the aspect of needs anylasis,system design,detailed design,system debugging and testing.For the places which need to be perfect,It offered a suggection. KeyWords ：Linux；Sendmail；Bind；Server 目 录 摘 要 I Abstract I 1 绪论 1 1.1课题背景 1 1.2课题目的 1 1.3课题意义 2 1.4国内外发展现状及趋势 2 1.5课题要求 3 2 可行性分析 4 2.1经济可行性分析 4 2.2技术可行性分析 4 2.3操作可行性分析 5 2.4 法律可行性 6 3 需求分析 7 3.1功能需求 7 3.2环境需求 7 3.3性能需求 8 4 系统设计 10 4.1方案论证 10 4.1.1 系统结构选择 10 4.1.2 邮件系统功能组件 10 4.2工作流程 11 4.3功能模块设计 11 4.4关键技术及相关原理 13 4.5重点难点
