email_domain_blocking_enabledWhen enabled, registration and email changes are rejected if the address domain matches a row in Admin → Blocked email domains (suffix match). Manage the list on that page.
securityConfigInterface::EMAIL_DOMAIN_BLOCKING_ENABLEDrequired|string|max:255falseOptions: true, false
featherpanel saas getsetting email_domain_blocking_enabled
featherpanel saas setsetting email_domain_blocking_enabled "<value>"