From b9a3ef486ebcde18a5ade37865ff8f397185d24f Mon Sep 17 00:00:00 2001
From: Till Brehm <tbrehm@ispconfig.org>
Date: Sun, 24 Jul 2016 05:30:59 -0400
Subject: [PATCH] Fixed #3979 Mailbox users unable to save autoresponders

---
 server/lib/classes/cron.d/900-letsencrypt.inc.php |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/server/lib/classes/cron.d/900-letsencrypt.inc.php b/server/lib/classes/cron.d/900-letsencrypt.inc.php
index f6c3cb6..5441ac2 100644
--- a/server/lib/classes/cron.d/900-letsencrypt.inc.php
+++ b/server/lib/classes/cron.d/900-letsencrypt.inc.php
@@ -36,7 +36,7 @@
 	public function onRunJob() {
 		global $app, $conf;
 
-		$letsencrypt = array_shift( explode("\n", $this->_exec('which letsencrypt certbot /root/.local/share/letsencrypt/bin/letsencrypt')) );
+		$letsencrypt = array_shift( explode("\n", shell_exec('which letsencrypt certbot /root/.local/share/letsencrypt/bin/letsencrypt')) );
 		if(is_executable($letsencrypt)) {
 			$version = trim(exec($letsencrypt . ' --version 2>/dev/null'));
 			if(preg_match('/^(\S+)\s+(\d+(\.\d+)+)$/', $version, $matches)) {

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