ACP2E-2734: Emails are failing to send

Author: thiaramus

app/code/Magento/Sales/Model/EmailSenderHandler.php

@@ -136,6 +136,11 @@ public function sendEmails()
                             $item->setEmailSent(true),
                             'email_sent'
                         );
+                    } else {
+                        $this->entityResource->saveAttribute(
+                            $item->setEmailSent(false),
+                            'email_sent'
+                        );
                     }
                 }
             }