Disable The Mail Alert By Crontab Command

http://www.cyberciti.biz/faq/disable-the-mail-alert-by-crontab-command/

 

Cron Job Prevent the sending of errors and output

To prevent the sending of errors and output, add any one of the following at the end of the line for each cron job to redirect output to /dev/null.
>/dev/null 2>&1.
OR
&> /dev/null

Cron Job Example

Edit/Open your cron jobs, enter:
$ crontab -e
Append string >/dev/null 2>&1 to stop mail alert:
0 1 5 10 * /path/to/script.sh >/dev/null 2>&1
OR
0 1 5 10 * /path/to/script.sh &> /dev/null
Save and close the file. Restart the crond:
# /etc/init.d/crond restart

MAILTO variable

As pointed out by Anand Sharma, you can set MAILTO="" variable at the start of your crontab file. This will also disable email. Edit/Open your cron jobs
$ crontab -e
At the top of the file, enter:
MAILTO=""
Save and close the file.