CentOS has yum-updatesd, which provides notification of updates which are available to be applied to your system. This notification can be done either via syslog, email or over dbus. Configuration is done via the /etc/yum/yum-updatesd.conf file
Open /etc/yum/yum-updatesd.conf file, enter:
# nano /etc/yum/yum-updatesd.conf
Setup variables as follows:
emit_via = email
# who to send the email to:
email_to = admin@example.com
# who send the notifications
email_from = adm@staff.example.com
