摘要： Ｓｅｎｄｍａｉｌ作为免费的邮件服务器软件，已被广泛应用于Ｉｎｔｅｒｎｅｔ备种操作系统中用来作为邮件服务器。但是近年来Ｓｅｎｄｍａｉｌ的安全问题显得越来越突出，给网络管理者增添了不少麻烦。本文主要以 ｓｅｎｄｍａｉｌ ｖ８．９．３为例，介绍ｓｅｎｄｍａｉｌ的安全设置方法，以及动态中继验证控制的实现方法。

关键词: 邮件安全, sendmail, 邮件中继, 邮件炸弹, 动态验证

Abstract: It is important for NIC that to secure a mail server against third-party relay and spammers. First this paper introduces some basic methods which against relay mail and spam mail in sendmail system, and then details how to use DRAC (dynamic relay authorization control) to protest a sendmail server.

中图分类号: 

• TP393.08