How To: Add SPF Record to Sub Domain
Most folks don’t realize that if you have a subdomain that sends email; that it probably should have a SPF record so that email will not be rejected as spam.
1) Log into Cpanel/WHM and navigate to:
Main >> DNS Functions >> Edit DNS Zone
2) Choose a Zone to Edit – example: foo.com
3) Find: “Add New Entries Below this Line”
4) Enter your corresponding variables such as this:
subdomain 14400 IN TXT "v=spf1 a mx ptr ~all"
5) Click on “Save”
This will reset Bind and your DNS zone should be updated.
To confirm that your subdomain is working properly, log into root and enter:
That should dispaly the new SPF record if all goes well.