From 9feb3cb9548ba4e0a783f153614baad0d99e0f87 Mon Sep 17 00:00:00 2001
From: pdontthink <pdontthink@7612ce4b-ef26-0410-bec9-ea0150e637f0>
Date: Sun, 22 May 2022 18:03:08 +0000
Subject: [PATCH] Fix PHP notice when property doesn't exist (#2863)

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@14952 7612ce4b-ef26-0410-bec9-ea0150e637f0
---
 class/deliver/Deliver.class.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/class/deliver/Deliver.class.php b/class/deliver/Deliver.class.php
index 403b88f3..258360e8 100644
--- a/class/deliver/Deliver.class.php
+++ b/class/deliver/Deliver.class.php
@@ -741,7 +741,7 @@ class Deliver {
             /* RFC 2298 */
             $header[] = 'Disposition-Notification-To: '.$dnt. $rn;
         }
-        if ($rfc822_header->dsn) {
+        if (isset($rfc822_header->dsn) && $rfc822_header->dsn) {
             $dsn = $rfc822_header->getAddr_s('dsn');
             $header[] = 'Return-Receipt-To: '.$dsn. $rn;
         }
-- 
2.25.1