I have a crontab (root) that runs a script and output is set to > /dev/null but I always get the emails whenever it runs. I only want to receive error emails.

# Rackspace driveclient update (12pm MST)
0 12 * * * /root/scripts/driveclient-update > /dev/null

The only way I can get it to turn off is to use > /dev/null 2>&1 but then I won't get error emails. This is happening on three different CentOS servers, two are 6.3 and one is 6.4.

NOTE: I have read over and over that > /dev/null is supposed to send stdout there and prevent the email if there is nothing but stdout from the script, so at works for at least some people; I cannot figure out why it is not working on these servers.

Here's an example of where > /dev/null is supposed to work:

http://www.alphadevx.com/a/384-Suppressing-Cron-Job-Email-Notifications