You can install domain keys on a cPanel server easily for a single domain, in this tutorial I am using cPanel 11.
Run the following command shown below:
[root@afrizal etc]# /usr/local/cpanel/bin/domain_keys_installer username
(i.e.: /usr/local/cpanel/bin/domain_keys_installer afrizal)
It will automatically installing Domain Key for the domain (afrizal.net) successfully.
Now you can verify it from the db record of the domain. The following [...]

Flush DNS function is to make a change on the computer to be accomodate change information that some settings changed or modificated at Domain, NameServer, DNS And the Website not yet seen for newest design or data data after updated although we have Refreshed Browser few times.
The DNS Modification conducted for example, a domain have [...]