From b83b561dd186b60206ce9f2ec7f7485c31c95a6c Mon Sep 17 00:00:00 2001
From: Julian Mallett <julian.mallett@gmail.com>
Date: Wed, 30 Mar 2016 17:33:44 +1000
Subject: [PATCH] Adding multipart/mixed as an html content type.

---
 src/Swift_Transport_PostmarkTransport.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Swift_Transport_PostmarkTransport.php b/src/Swift_Transport_PostmarkTransport.php
index 0113c72..ff2189f 100644
--- a/src/Swift_Transport_PostmarkTransport.php
+++ b/src/Swift_Transport_PostmarkTransport.php
@@ -143,6 +143,7 @@ public function send(\Swift_Mime_Message $message, &$failedRecipients = null)
         switch ($message->getContentType()) {
             case 'text/html':
             case 'multipart/alternative':
+            case 'multipart/mixed':
                 $data['HtmlBody'] = $message->getBody();
                 break;
             default: