How do I add domain keys and SPF records for my domains?
If you have a Dedicated or Virtual server with cPanel, you can
log-in via the unix shell as root and issue the following commands:
/usr/local/cpanel/bin/spf_installer your username
/usr/local/cpanel/bin/domain_keys_installer your_username
Replace your_username above with the name of your account you created in cPanel. The above two commands will setup SPF and Domain keys for each domain on that account.