By defaul, HubSpot offer only one Email contact field that we can validate the domain: https://knowledge.hubspot.com/forms/block-form-or-pop-up-form-submissions-from-specific-email-domains https://knowledge.hubspot.com/forms/what-domains-are-blocked-when-using-the-forms-email-domains-to-block-feature We can have situations that have a form with other contact personas, like this: The issue is, we can't validate other email custom fields. In this case. 1) HubSpot has a new type to custom fields, like email tpe OR 2) When we create a custom field, we can select single line text type and in the rules validation, we have a email checbox rule And in the forms, this will enable the functionality domain blocked
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