Nightly linux updates doesn't work

Nightly linux updates, ie yum-cron, doesn't work. I run CentOS 5.

1. # chkconfig --list|grep yum-cron
2. # /etc/init.d/yum-cron restart
3. # chkconfig --list|grep sendmail
4. # chkconfig sendmail on
5. # /etc/init.d/sendmail restart
6. # vi /etc/hosts.allow
7. Make sure these two lines are present in hosts.allow;
   1. ALL: 127.0.0.1
   2. sendmail: localhost

If it still fails, contakt the linux admin!

Also see Yum-cron settings.