you have mail in /var/spool/mail/root in centos

#cat /etc/issue
CentOS release 6.7 (Final)
Kernel \r on an \m

#cat /etc/*release
CentOS release 6.7 (Final)
CentOS release 6.7 (Final)
CentOS release 6.7 (Final)

#cat /etc/*version

#mail
you can see all your mails