title: how can i fix crond[296824]: No configuration file found at /root/.esmtprc or /etc/esmtprc?
body: <p>I use aws crontab to run my task.</p>
  <p>it ran smoothly for some days, but today, i found crontab failed, when i open /var/log/cron
  it failed to print new message, and i found</p>
  <pre><code>crond[296824]: No configuration file found at /root/.esmtprc or
  /etc/esmtprc
  </code></pre>
  <p>in /var/log/messages, and all mail log is empty.
  My Os is Centos8, can anyone offer some suggestions? Thanks a lot</p>