Email Authentication - SPF and DomainKeysWritten by Brad Markle
Beginning in late March of 2010, our shared servers are being upgraded to the latest version of cPanel, which now allows users to create their own SPF records and Domain Keys. SPF and Domain Keys are tools used by many mail servers in an effort to combat spam, so if you're having an issue with your email being bounced back or arriving in the junk/spam folders of your recipients, it is suggested to enable these settings. Please keep in mind that as these are DNS settings, they may take up to 24 hours or more before they begin to take effect.
(Warning: cPanel is unable to verify that this server is an authoritative nameserver for your-domain.com [?])This is a known bug within cPanel and can be disregarded. cPanel checks the local server for DNS in cPanel causing this error. As long as you can check them at the following link you DNS should work fine.
About Domain Keys and SPF Records
Domain Keys is an e-mail authentication system that allows for incoming mail to be checked against the server it was sent from to verify that the mail has not been modified. This ensures that messages are actually coming from the listed sender and allows abusive messages to be tracked with more ease.
SPF will specify which machines are authorized to send email from your domain(s). This means that only mail sent through this server will appear as valid mail from your domain(s) when the SPF records are checked.
Yahoo - Domain keys - http://help.yahoo.com/l/us/yahoo/mail/classic/context/context-07.html
Google - SPF - http://www.google.com/support/a/bin/answer.py?hl=en&answer=33786
AOL - SPF - http://postmaster.aol.com/spf/details.html
AOL - Domain keys - http://postmaster.aol.com/Postmaster.DKIM.html
How to Implement Domain Keys and SPF Records
If you need further assistance, or, if you do not have the "Email Authentication" icon in your cPanel, please email firstname.lastname@example.org for further assistance.