Update InboundEmail.php

Author: maximehinnekens

src/InboundEmail.php

@@ -145,9 +145,9 @@ protected function convertReceivedHeaders($headers): array
  $parts = [];
 
  foreach($headers as $header){
- if ($header instanceof ReceivedHeader) {
+
  $parts = $parts + $header->getParts();
- }
+ 
  }
 
  return $parts;