Index: externals/amazon-ses/ses.php
===================================================================
--- externals/amazon-ses/ses.php
+++ externals/amazon-ses/ses.php
@@ -568,6 +568,7 @@
   * @return integer
   */
   private function __responseWriteCallback(&$curl, &$data) {
+    if(!isset($this->response->body)) $this->response->body = '';
     $this->response->body .= $data;
     return strlen($data);
   }
@@ -739,4 +740,4 @@
  */
 final class SimpleEmailServiceException extends Exception {
 
-}
\ No newline at end of file
+}