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<h2><a NAME="s11.5"></a>11.5 Sendmail</h2>
<p><a NAME="i662"></a></p>
<p><a NAME="i663"></a>一个默认的sendmail.cf文件将被安装在/etc下。该配置文件可工作于仅使用SMTP的
站点。而不能工作于UUCP站点；如果您要使用UUCP进行邮件传输就得重新生成一个
新的sendmail.cf。这样的话，您就需要安装m4和sendmail的源代码包。请您阅读sendmail
源代码中的README以获取更为详尽的创建snedmail配置文件的方法。也可以看
O'Reilly&Associates出版的一本有关sendmail的不错的参考书（作者：Bryan
Costales). <a NAME="i664"></a><a NAME="i665"></a></p>
<p>一种常用的sendmail的配置用一台机器作为网络中所有主机的邮件网关。打个比方，
在红帽子软件公司我们有一台地址为mail.redhat.com的机器来处理我们所有的邮件。
我们只需简单的将mail.redhat.com要处理邮件的机器的名字加入/etc/sendmail.cw。下面
是该文件的一个例子：<a NAME="i666"></a></p>
<blockquote>
<pre># sendmail.cw - include all aliases for your machine
# here.
torgo.redhat.com
poodle.redhat.com
devel.redhat.com
</pre>
</blockquote>
<p>同样在torgo,poodle和devel的那些机器中编辑/etc/sendmail.cf，使其象mail.redhat.com
那样发送邮件，转发本地的邮件给redhat.com。 编辑含DH和DM的那些行：</p>
<blockquote>
<pre># who I send unqualified names to
# (null means deliver locally)
DRmail.redhat.com
# who gets all local email traffic
DHmail.redhat.com
# who I masquerade as (null for no masquerading)
DMredhat.com
</pre>
</blockquote>
<p><a NAME="i667"></a>以这种配置，所有发出的邮件都好象是丛redhat.com发出的，而任何发往torgo.redhat.com
和其它机器的邮件都将发送给mail.redhat.com</p>
<p>请注意，如果您将您的系统配置为以另一机器身份发送邮件的话，任何以本系统为目的
的邮件都将被发送至那台主机。比如，由cron进程定期产生的发网root@poodle.redhat.com
日志文件都将发送给root@mail.redhat.com。</p>
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