{
  "type": "select",
  "key": "email_domain_blocking_enabled",
  "constant": "EMAIL_DOMAIN_BLOCKING_ENABLED",
  "description": "When 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.",
  "required": true,
  "placeholder": "false",
  "validation": "required|string|max:255",
  "options": [
    "true",
    "false"
  ],
  "category": "security",
  "sensitive": false
}