我的CentOS是安装在VMware虚拟机下面的，近段时间启动时sendmail启动非常慢，需要好几分钟，从这儿得到启发，然后按照上面修改的就改好了:-)
将 [root@CentOS_Test_Server ~]# cat /etc/hosts # Do not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 localhost.localdomain localhost #::1 localhost6.localdomain6 localhost6 修改为 [root@CentOS_Test_Server ~]# cat /etc/hosts # Do not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 localhost.localdomain localhost CentOS_Test_Server #::1 localhost6.localdomain6 localhost6 即可，就是在127.0.0.1那一行的最后面加上操作系统的主机名即可，CentOS_Test_Server来自哪儿呢，是我自定义的，来自于文件/etc/sysconfig/network
[root@CentOS_Test_Server ~]# cat /etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=no GATEWAY=192.168.1.1 HOSTNAME=CentOS_Test_Server
重启sendmail服务，1秒左右就启动完成了，ok，搞定，完成。 [root@CentOS_Test_Server ~]# service sendmail restart Shutting down sm-client: [ OK ] Shutting down sendmail: [ OK ] Starting sendmail: [ OK ] Starting sm-client: [ OK ]