Nagios监控的说：Sendmail无法发送mail邮件了，你怎么办，想哪出了错了，其实很简单就解决了，请看下文。

　　nagios 监控无法发送mail邮件。发现是文件权限问题

　　You should first check the permissions on the following files:

　　# ls -l /usr/sbin/sendmail.sendmail

　　-r-xr-sr-x root smmsp /usr/sbin/sendmail.sendmail

　　# ls -l /var/spool

　　drwxrwx— smmsp smmsp /var/spool/clientmqueue

　　If your permissions are mis-matched, you can modify them by doing the following:

　　# chown root.smmsp /usr/sbin/sendmail.sendmail

　　# chmod g+s /usr/sbin/sendmail.sendmail

　　# chown smmsp.smmsp /var/spool/clientmqueue

　　After changing permissions, you need to restart the Sendmail service, type:

　　# service sendmail restart

大家能看懂吧，其实Sendmail无法发送mail邮件问题很好解决，希望文章对你们有用！