optimized sql-query for greylisting-check

Author: Dominik

install/lib/installer_base.lib.php

@@ -854,10 +854,6 @@ public function configure_postfix($options = '') {
 
 	}
 
-	public function configure_postgrey() {
-		
-	}
-
 	public function configure_saslauthd() {
 		global $conf;
 

install/tpl/mysql-virtual_policy_greylist.cf.master

@@ -1,5 +1,5 @@
 user = {mysql_server_ispconfig_user}
 password = {mysql_server_ispconfig_password}
 dbname = {mysql_server_database}
-query = SELECT DISTINCT('greylisting') FROM mail_forwarding mf, mail_user mu where (mf.source='%s' and mf.greylisting='y' and mf.server_id = {server_id}) or (mu.email='%s' and mu.greylisting='y' and mu.server_id = {server_id})
+query = SELECT 'greylisting' FROM (SELECT greylisting, source AS email FROM mail_forwarding WHERE server_id = {server_id} UNION SELECT greylisting, email FROM mail_user WHERE server_id = {server_id}) addresses WHERE addresses.email='%s' AND addresses.greylisting='y'
 hosts = {mysql_server_ip}