check the content of the file /etc/sysconfig/network Make sure you have in here what the external dns name is. HOSTNAME=mail.johnson.com This line SHOULD be in accordance of the /etc/hosts file. If your server has an ip address like 192.168.4.1 then your /etc/hosts file should look like 127.0.0.1 localhost.localdomain localhost 192.168.0.19 mail.johnson.com mail Install DNSMASQ yum …
