domainkey not enabled

Hi,

I have followed the instructions on how to set up domainkey, but I get "DomainKeys are not enabled, as the text record validation has failed. Please try again."

my domain (Keywordsfly.com) is hosted in cpanel I configured TXT record as explained in tutorials.

I am using free zoho mail account, does that affect the process (I am planing to upgrade very soon, am just testing your service). But I try many time and I am disappointed with this error.
Please Help me.