1.在DNS里面设置转发功能 vim /var/named/chroot/etc/named.conf [attach]820[/attach] forwarders { 172.18.0.6；}； 设置公网的DNS服务器 2.设置sendmail的转发功能 vim /etc/mail/access # by default we allow relaying from localhost... Connect:localhost.localdomain RELAY Connect:localhost RELAY Connect:127.0.0.1 RELAY Connect:mail.qq.com RELAY 注明：这个是可以转发的公网mail服务器 ~ 3.测试结果如下 [attach]819[/attach]