Checkout page - Check if guest is already subscribed to Newsletter

Question

In Checkout page, there's a checkbox that allows guests to subscribe to Newsletter by placing their order.

But there is no control over already subscribed emails. If guest's email is already included in newsletter subscribers list, guest receives the "Thank you for your Newsletter Subscription" email again.

Is there a way to display an error message in checkout page or even hide the newsletter checkbox, in case the customer's email is already included in newsletter subscribers?

Answer 1

Check if the guest customer has subscribed to the newsletter from checkout page by using event observer. You may need to create a Custom module

Use this event:

<newsletter_subscriber_save_after>
  <observers>
    <namespace_module_model_observer>
      <class>Namespace_Module_Model_Observer</class>
      <method>subscribedToNewslettercheck</method>
    </namespace_module_model_observer>
  </observers>
</newsletter_subscriber_save_after>

In Observer file you can check like this way

class Namespace_Module_Model_Observer {
        public function subscribedToNewslettercheck(Varien_Event_Observer $observer)
    {
        $event = $observer->getEvent();
        $subscriber = $event->getDataObject();
        $data = $subscriber->getData();
        $email = $data['subscriber_email'];


        $statusChange = $subscriber->getIsStatusChanged();
        if ($data['subscriber_status'] == "1" && $statusChange == true) {
                        //code to handle if customer is just subscribed...
                }
        }
}