diff --git a/lib/private/mail.php b/lib/private/mail.php
index 691ae1dd33f..8ba7343e011 100644
--- a/lib/private/mail.php
+++ b/lib/private/mail.php
@@ -61,6 +61,7 @@ class OC_Mail {
 		$mailo->Port = $SMTPPORT;
 		$mailo->SMTPAuth = $SMTPAUTH;
 		$mailo->SMTPDebug = $SMTPDEBUG;
+		$mailo->Debugoutput = 'error_log';
 		$mailo->SMTPSecure = $SMTPSECURE;
 		$mailo->AuthType = $SMTPAUTHTYPE;
 		$mailo->Username = $SMTPUSERNAME;