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用的是 Ubuntu 16.04 ，通过 crontab -e 命令添加了定时任务后，定时任务执行是日志中会出现下面的错误提示：
Please install an MTA on this system if you want to use sendmail!
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这个报错不是很明显么 如果想使用发送邮件或广播功能,请先在系统内安装一个MTA
定时任务不能执行是由于
command not found，在 crontab 配置中设置PATH后解决