How to stop cron.daily mail.

How to stop Err message from cron.daiy on v13.1.0.1.

/var/log/cron

err anacron[28233]: Tried to mail output of job `cron.daily', but mailer process (/usr/sbin/sendmail) exited with ststus 1

/var/log/maillog

err sSMTP[10718]: Cannot open localhost:25
err sSMTP[10718]: Unable to connect to "localhost" port 25.

Edit /etc/sysconfig/crond. CRONDARGS="" --->> CRONDARGS="-m off"

 Settings for the CRON daemon.
 CRONDARGS= :  any extra command-line startup arguments for crond
CRONDARGS="-m off"

Is this method correct?