If you are hosting a domain's web traffic but using another service to manage its mail, contact forms on the website will not work correctly unless you change tell the server that the domain is using a remote mail exchanger. This can be done in WHM for any cPanel account you control.
- Log in to WHM
- On the left hand side of the page, click "Edit DNS Zone" underneath the "DNS Functions" heading.
- Select the domain you wish to configure from the list, then click "Edit"
- Scroll down to the bottom of the page and click the radio button next to "Remote Mail Exchanger".
- Click "Save".
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If you wish to start managing mail through the domain again, you'll just need to change this setting back to "Local Mail Exchanger" and edit the MX records as necessary.