Sometimes, you may want or need to block public email IDs such as gmail.com or yahoo.com from filling out a landing page form. You can do this by editing the form properties in the landing page editor.
- Unlock the landing page editor
- Click on the form container
- The form container object editor will open
- Click on the "Omit non-company domains" option

- Enter in the domains of companies you would like to exclude
- Click save and save your landing page.
The next time your landing page is visited by contacts with those email IDs, they will be blocked from completing the form.