Magento 2 – How to Set Owner Email Address to Get New Order Email

This issue could be related to the new Magento Email Queue system, that leaves orphan records on the Recipients table.

If this is your issue, I've sent a fix on this post: https://magento.stackexchange.com/a/87299/23057

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$resource = $objectManager->get('Magento\Framework\App\ResourceConnection');
$connection = $resource->getConnection();

//*****************loading Customer session *****************//
$customerSession = $objectManager->create('Magento\Customer\Model\Session');

//******** Checking whether customer is logged in or not ********//
if ($customerSession->isLoggedIn()) {
$customer_email = $customerSession->getCustomer()->getEmail();

// ***********Getting order collection using customer email id ***********//
 $order_collection = $objectManager->create('Magento\Sales\Model\Order')->getCollection()->addAttributeToFilter('customer_email', $customer_email);

 //echo "<pre>";print_r($order_collection->getData());
 foreach ($order_collection as $order){ 
    echo "Order Id: ".$order->getEntityId(); 
    echo "Customer Id: ".$order->getCustomerId(); 
   } 
}

Order collection based on logged in Customer Email Id (Customer All orders)

I hope this will help