Merge branch '5.0'

* 5.0:
  Fix code
  Tweak the code to avoid fabbot false positives

Transport/PostmarkApiTransport.php

@@ -56,7 +56,7 @@ protected function doSendApi(SentMessage $sentMessage, Email $email, Envelope $e
 
         $result = $response->toArray(false);
         if (200 !== $response->getStatusCode()) {
-            throw new HttpTransportException(sprintf('Unable to send an email: %s (code %d).', $result['Message'], $result['ErrorCode']), $response);
+            throw new HttpTransportException(sprintf('Unable to send an email: '.$result['Message'].' (code %d).', $result['ErrorCode']), $response);
         }
 
         $sentMessage->setMessageId($result['MessageID']);