Event for Post Dispatch on Newsletter not working in custom module

Question

I have created an event on my new custom module to display something after new newsletter subscriber have subscribe both nothing is showing. I reference this for event Here for both postdispatch and predispatch

The event.xml shown below

<?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="controller_action_postdispatch_newsletter_manage_save">
    <observer name="controller_action_dispatch_newsletter" instance="Company\Module\Observer\Update" />
  </event>
</config>

This is the observer is shown below /observer/Update.php

 <?php
 namespace Company\Module\Observer;

 use Magento\Framework\Event\Observer;
 use Magento\Framework\Event\ObserverInterface;

class Update implements \Magento\Framework\Event\ObserverInterface
{


public function execute(\Magento\Framework\Event\Observer $observer)
{
    echo "email";
    exit; //un commet this to make sure event works
}
 }

Thank You