diff -Nuar a/vendor/magento/module-sales/Model/AdminOrder/EmailSender.php b/vendor/magento/module-sales/Model/AdminOrder/EmailSender.php
index 4e068eb571d..2e9518600c2 100644
--- a/vendor/magento/module-sales/Model/AdminOrder/EmailSender.php
+++ b/vendor/magento/module-sales/Model/AdminOrder/EmailSender.php
@@ -5,10 +5,13 @@
  */
 namespace Magento\Sales\Model\AdminOrder;
 
-use Psr\Log\LoggerInterface as Logger;
+use Magento\Framework\Exception\MailException;
 use Magento\Framework\Message\ManagerInterface;
 use Magento\Sales\Model\Order;
+use Magento\Sales\Model\Order\Email\Sender\InvoiceSender;
 use Magento\Sales\Model\Order\Email\Sender\OrderSender;
+use Magento\Sales\Model\Order\Invoice;
+use Psr\Log\LoggerInterface as Logger;
 
 /**
  * Class EmailSender
@@ -30,21 +33,31 @@ class EmailSender
      */
     protected $orderSender;
 
+    /**
+     * @var InvoiceSender
+     */
+    private $invoiceSender;
+
     /**
      * @param ManagerInterface $messageManager
      * @param Logger $logger
      * @param OrderSender $orderSender
+     * @param InvoiceSender $invoiceSender
      */
-    public function __construct(ManagerInterface $messageManager, Logger $logger, OrderSender $orderSender)
-    {
+    public function __construct(
+        ManagerInterface $messageManager,
+        Logger $logger,
+        OrderSender $orderSender,
+        InvoiceSender $invoiceSender
+    ) {
         $this->messageManager = $messageManager;
         $this->logger = $logger;
         $this->orderSender = $orderSender;
+        $this->invoiceSender = $invoiceSender;
     }
 
     /**
-     * Send email about new order.
-     * Process mail exception
+     * Send email about new order and handle mail exception
      *
      * @param Order $order
      * @return bool
@@ -53,7 +66,8 @@ class EmailSender
     {
         try {
             $this->orderSender->send($order);
-        } catch (\Magento\Framework\Exception\MailException $exception) {
+            $this->sendInvoiceEmail($order);
+        } catch (MailException $exception) {
             $this->logger->critical($exception);
             $this->messageManager->addWarningMessage(
                 __('You did not email your customer. Please check your email settings.')
@@ -63,4 +77,19 @@ class EmailSender
 
         return true;
     }
+
+    /**
+     * Send email about invoice paying
+     *
+     * @param Order $order
+     */
+    private function sendInvoiceEmail(Order $order): void
+    {
+        foreach ($order->getInvoiceCollection()->getItems() as $invoice) {
+            /** @var Invoice $invoice */
+            if ($invoice->getState() === Invoice::STATE_PAID) {
+                $this->invoiceSender->send($invoice);
+            }
+        }
+    }
 }