Removes one domain from the form's options.blocked_email_domains, so the form takes submissions from addresses at it again. Pass the domain in the domain query parameter. It is cleaned as it was when added, so @Competitor.com removes competitor.com. Removing *.example.com leaves example.com blocked if it is on the list, and the other way round. To unblock personal providers such as gmail.com, use PUT /forms/{id}/allowPersonalEmailProviders. Requires the permission to edit forms.