From 8e654f4b0b775f34db051017c4c41a592643a11c Mon Sep 17 00:00:00 2001
From: Rich Lott / Artful Robot <forums@artfulrobot.uk>
Date: Fri, 2 Aug 2019 13:55:11 +0100
Subject: [PATCH] Change way headers are added to message to use explicit
 headers key as this seems to be more generally implemented

---
 mailgunny.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mailgunny.php b/mailgunny.php
index 9f266f8..328fa5b 100644
--- a/mailgunny.php
+++ b/mailgunny.php
@@ -142,11 +142,11 @@ function mailgunny_civicrm_entityTypes(&$entityTypes) {
 function mailgunny_civicrm_alterMailParams(&$params, $context) {
   if (isset($params['X-CiviMail-Bounce'])) {
     // Copy this header to one that will be returned by Mailgun's webhook.
-    $params['X-Mailgun-Variables'] = json_encode(['civimail-bounce' => $params['X-CiviMail-Bounce']]);
+    $params['headers']['X-Mailgun-Variables'] = json_encode(['civimail-bounce' => $params['X-CiviMail-Bounce']]);
   }
   elseif (isset($params['Return-Path'])) {
     // Copy this header to one that will be returned by Mailgun's webhook.
-    $params['X-Mailgun-Variables'] = json_encode(['civimail-bounce' => $params['Return-Path']]);
+    $params['headers']['X-Mailgun-Variables'] = json_encode(['civimail-bounce' => $params['Return-Path']]);
   }
   else {
     // Probably a single email, for which we don't have any useful information to add.