diff --git a/lib/private/mail.php b/lib/private/mail.php
index 82107c32dc733aa63faad6edfea90d7477ac9b28..691ae1dd33f3d1f760c8aaf97c4757cbffa524b5 100644
--- a/lib/private/mail.php
+++ b/lib/private/mail.php
@@ -70,6 +70,7 @@ class OC_Mail {
 		$mailo->From = $fromaddress;
 		$mailo->FromName = $fromname;;
 		$mailo->Sender = $fromaddress;
+		$mailo->XMailer = ' ';
 		try {
 			$toaddress = self::buildAsciiEmail($toaddress);
 			$mailo->AddAddress($toaddress, $toname);