DomainKeys is an e-mail authentication system designed to verify the DNS domain of an e-mail sender and the message integrity. The DomainKeys specification has adopted aspects of Identified Internet Mail to create an enhanced protocol called DomainKeys Identified Mail (DKIM).
If you have root access to your cpanel server then you can install the SPF & Domain Keys as follows,
Quote:
/usr/local/cpanel/bin/domain_keys_installer username
/usr/local/cpanel/bin/spf_installer username
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Once you execute these scripts, the TXT record will be added to the zone file at /var/named/domainaname.com.db .