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Important! cPanel will show the following error when setting up your DKIM and SPF records.
(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.

Port25 Domain Key Wizard

About Domain Keys and SPF Records

Domain Keys
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
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.

Additional Info
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

SPF Records and Domain Keys can be set within the "Email Authentication" section of your cPanel. The specific instructions are in the cPanel, and you can also visit cPanel's own website for more details:
http://docs.cpanel.net/twiki/bin/view/AllDocumentation/CpanelDocs/EmailAuthentication

If you need further assistance, or, if you do not have the "Email Authentication" icon in your cPanel, please email support@inmotionhosting.com for further assistance.

If you missed our previous article, please see the Combating Spam: Using SpamAssassin tutorial. For more information on this course please visit Preventing Spam. Please see the next article on how to Permanently stop spam with SpamCop.

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