From c468ba6479ec9e9c885692bba69f55df4ce62864 Mon Sep 17 00:00:00 2001
From: Roland Gruber <post@rolandgruber.de>
Date: Sun, 2 Feb 2020 20:39:44 +0100
Subject: [PATCH] fixed mail sending

---
 lam/lib/account.inc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lam/lib/account.inc b/lam/lib/account.inc
index efeae0dc..05720b02 100644
--- a/lam/lib/account.inc
+++ b/lam/lib/account.inc
@@ -1370,7 +1370,7 @@ function sendEMail($to, $subject, $text, $headers, $returnPath) {
 	}
 	logNewMessage(LOG_DEBUG, "Send mail to $to\n" . $text);
 	$additionalParams = null;
-	if (isCommandlineSafeEmailAddress($returnPath)) {
+	if (!empty($returnPath) && isCommandlineSafeEmailAddress($returnPath)) {
 		$additionalParams = '-f' . $returnPath;
 	}
 	return mail($to, base64EncodeForEMail($subject), $text, $headers, $additionalParams);