cacti 插件thold不能发送邮件

cacti 插件thold不能发送邮件

我已经安装cacti的thold的插件,我在邮件测试时报这个错,请问这是怎么回事啊?

Checking Configuration...
Creating Message Text...

This is a test message generated from Cacti. This message was sent to test the configuration of your Mail Settings.

Your email settings are currently set as follows

Method: Sendmail
Sendmail Path: /usr/sbin/sendmail

Sending Message...

ERROR: DirectInject command output: 'Recipient names must be specified ' error: ''
DirectInject command output: 'Recipient names must be specified ' error: ''
有人遇到过么?
你好,这个问题你解决了吗,能否指导一下