Getting email alerts for cron jobs

I setup a cron job and I am getting email alerts each time its run (every 15 minutes). In the cron settings, I have ‘Hide Standard Output’ unchecked. These are successful cron task, since the email states “OK” at the end. I don’t see any alerts specific to cron jobs in the ‘Alerts’ section. Any ideas how I can stop getting these alerts sent for successful cron jobs? I just need an alert for failed jobs.

Check this, but leave unchecked “Hide standard error” (assuming your cron will raise an eccepiton when “not ok”)