Cron job is not sending email notifications

Symptoms

You have set the email address for cronjobs to send notifications to, but the cronjob is not sending the email.

Description 

If the email address is set for a cronjob, it will only send a notification if the script or binary that is being executed produces some sort of output. There are a few things to check to ensure that the cron emails are working as expected:

• Verify the cron job is running in the cron logs. The following article can assist with this:
  How to verify if a cronjob was run
• Verify that the "mailto" variable is set properly, and the output is not being redirected to /dev/null. This will prevent a cron job from producing any output:
  How to silence a cron / cronjob so that it does not send notifications
• Verify that the "CRONDARGS" variable has not disabled email output. You can check the crond configuration file for the variable to see how it has been set:
  

  [root@10-2-33-202 ~]# grep "CRONDARGS" /etc/sysconfig/crond
  # CRONDARGS= : any extra command-line startup arguments for crond
  CRONDARGS="-s -m off"

  By default these flags are empty. If you find that the "-m off" flag is present, remove this from the configuration and restart crond to continue sending messages.
• Execute the cron job manually to ensure it generates output. Please note this must be done a certain way to ensure the safety of your server. Please review the following article for the instructions on executing a cron safely on the command line:
  How to troubleshoot user-level cronjob issues
• Check the Exim logs to see if the email is leaving the server. You can use exigrep to search for the email address configured in your crontab:

  exigrep emailaddress@example.com /var/log/exim_mainlog