Added mail() function from interface to ispconfig server part.

Author: Till Brehm

server/cron_daily.php

@@ -647,7 +647,7 @@ function setConfigVar( $filename, $varName, $varValue, $append = 0 ) {
 // function for sending notification emails
 //########
 function send_notification_email($template, $placeholders, $recipients) {
-	global $conf;
+	global $conf, $app;
 
 	if(!is_array($recipients) || count($recipients) < 1) return false;
 	if(!is_array($placeholders)) $placeholders = array();