mhorbul

here is my version of fixing it as $curl is not available here.

--- postmark.php.origin 2015-05-19 22:34:44.728346590 -0600
+++ postmark-approved-wordpress-plugin/postmark.php     2014-06-10 14:39:08.000000000 -0600
@@ -286,8 +286,8 @@

     $response = pm_send_mail($postmark_headers, $email);

-    if ($response !== true){
-       return "Test Failed with Error ".$response['body'];
+    if ($response === false){
+       return "Test Failed with Error ".curl_error($curl);
     } else {
        return "Test Sent";
        }
@@ -306,8 +306,8 @@
        if($response['response']['code'] == 200) {
                return true;
        } else {
-               return $response;
+               return false;
        }
 }