Follow the steps below to prevent users from submitting your form with email addresses at certain domains.
- Navigate in HubSpot Marketing to Contacts > Form
- Click on the name of the form to open it in the editor
- Hover over the email field and click the pencil icon
- Enter the domains you want to block under Email Domains to Block separated by commas
- Enter: "gmail.com" or "gmail.com, hotmail.com"
- Do not enter: "www.gmail.com" or "@gmail.com"
- Click Done Editing > Save form