diff --git a/htdocs/core/class/CMailFile.class.php b/htdocs/core/class/CMailFile.class.php
index 418ef0612ba..f87bafb513d 100644
--- a/htdocs/core/class/CMailFile.class.php
+++ b/htdocs/core/class/CMailFile.class.php
@@ -6,7 +6,7 @@
  * Copyright (C) 2003       Jean-Louis Bergamo      <jlb@j1b.org>
  * Copyright (C) 2004-2015  Laurent Destailleur     <eldy@users.sourceforge.net>
  * Copyright (C) 2005-2012  Regis Houssin           <regis.houssin@inodbox.com>
- * Copyright (C) 2019-2022  Frédéric France         <frederic.france@netlogic.fr>
+ * Copyright (C) 2019-2023  Frédéric France         <frederic.france@netlogic.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -512,7 +512,7 @@ class CMailFile
 
 			// Give the message a subject
 			try {
-				$result = $this->message->setSubject($this->subject);
+				$this->message->setSubject($this->subject);
 			} catch (Exception $e) {
 				$this->errors[] = $e->getMessage();
 			}
@@ -557,6 +557,14 @@ class CMailFile
 				}
 			}
 
+			if (!empty($this->errors_to)) {
+				try {
+					$this->message->setReturnPath($this->getArrayAddress($this->errors_to));
+				} catch (Exception $e) {
+					$this->errors[] = $e->getMessage();
+				}
+			}
+
 			try {
 				$this->message->setCharSet($conf->file->character_set_client);
 			} catch (Exception $e) {