[CentOS] Need help in securing maildir so that root usershould not able to read anyother user's mail

[Feizhou]

> When you have to do system maintenance, you will have to
> boot from CD, fix the root account, reboot and do the 
> maintenance.  The sysadmin will do the maintenance from
> a checklist while a large Marine guard with and M16 follows
> along.  When done, scramble the root password.

Boot from CD?!?! Linux single is all you need.

A large Marine guard? Man, this must be a joke post right? Where is the 
smiley? Bring along a clueless Marine armed with a M16?