vendor/module/etc/events.xml
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
<event name="newsletter_subscriber_save_after">
<observer name="vendor_module_observer_myobserver" instance="Vendor\Module\Observer\MyObserver" />
</event>
</config>
Vendor\Module\Observer\MyObserver.php
<?php
namespace Vendor\Module\Observer;
use Magento\Framework\Event\Observer;
class MyObserver implements \Magento\Framework\Event\ObserverInterface
{
public function execute(Observer $observer)
{
$subscriber = $observer->getEvent()->getSubscriber();
$email = $subscriber->getEmail();
$subscriberStatus = $subscriber->getSubscriberStatus();
// subscriberStatus = 1 subscribe
// subscriberStatus = 3 unsubscribed
if ( $subscriberStatus == '1') {
// your code
}
}
}
It works both on frontend and backend
