Disable mailing in cron globaly
Solution 1:
according to the man page can disable cron mail by adding -m off
to the daemon args
-m This option allows you to specify a shell command to use for sending Cron mail output instead of using sendmail(8) This command must accept a fully formatted mail message (with headers) on stan‐ dard input and send it as a mail message to the recipients specified in the mail headers. Specify‐ ing the string off (i.e., crond -m off) will disable the sending of mail.