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Linux下邮件服务器应用与安全研究
E-mail server applications and security research base on Linux.
Sendmail作为免费的邮件服务器软件，目前几乎所有的Unix/Linux系统都在使用,
As a free mail server software ,Sendmail is now in use on almost all kinds of systems of Unix/Linux,

它适用性强、有抗垃圾邮件能力和抗攻击能力。
it has a good compatibility and it has anti-spam capability and anti-attack capability.
本文中对Sendmail进行了成功配置，
In this article Sendmail have been configed successfully,
包括Sendmail的安装、帐号的管理、DNS的配置、MX记录的配置、Sendmail的配置，并用OUTLOOK验证了其功能。
including Sendmail installation, account management, DNS configuration, MX-record configuration,Sendmail configuration, and verified its functions by OUTLOOK.
还研究了Sendmail目前的一些安全问题，并找出相应的解决方法，
and studied some of the current problems about security,and found out the solutions to the problems,
比如通过设置来实现对Sendmail用户的限制、以非root身份登陆来防止权限被滥用等等。
such as to limit Sendmail users by the configuration, to avoid abusing the popedom by non-root l