[root@test2 ~]# yum -y install sendmail

[root@test2 ~]# sendmail -t <<EOF

> FROM: Mail zhangdonghong<zhangdonghongemail@163.com>

> To: zhangdh@taoying.com

> Cc: 1037447289@qq.com

> Subject: testing

> hello world!

> EOF

等待数十秒...

气愤啊：就QQ邮箱收到了...

补充：原来是被企业邮箱当成垃圾邮件被拒了，汗...