When using yum-cron, you might want to receive email notifications when updates are applied. Here is how you enable these notifications for CentOS. This article assumes a properly configured mail service.
Installing yum-cron
Install yum-cron using the yum package manager:
Modify the /etc/sysconfig/yum-cron file and add your email address to the MAILTO line.
Be sure to read up on the other settings in this file. You can disable automatic updates and only have the system send the notification.