STEP 2: Set up the Clearout Email Validator plugin. Go to your dashboard Settings --> Clearout Email Validator (make sure you’ve activated the plugin) paste your API token.Click the ‘Apply’ button after settings.
Note: By default, the plugin will block role-based addresses, disposable addresses . You can allow either or both by choosing the checkboxes in the settings.
You can even change the setting to 'accept only business addresses', which will override other settings.