diff --git a/Python/etc/postfix/main.cf b/Python/etc/postfix/main.cf
index 1b1e3d0..7461d43 100644
--- a/Python/etc/postfix/main.cf
+++ b/Python/etc/postfix/main.cf
@@ -222,8 +222,31 @@ if main:
 
 if main:
     @# Filtrage sur les sources de connexions
-    smtpd_client_restrictions = "reject_rbl_client dnsbl.ahbl.org"
-
+    print "smtpd_client_restrictions = permit_mynetworks,"
+    print "    reject_rbl_client dnsbl.ahbl.org,"
+    print "    reject_rbl_client zen.spamhaus.org,"
+    print "    reject_rbl_client dnsbl.sorbs.net,"
+    print "    reject_rbl_client list.dsbl.org,"
+    print "    reject_rbl_client multihop.dsbl.org"
+    @
+    @#
+    @# Requiring this will stop some UCE software. 
+    @# (UCE = Unsolicited Commercial Email = SPAM)
+    @#
+    smtpd_require_helo = "yes"
+    @
+    @# Reject the request when the client HELO or EHLO parameter has a bad hostname syntax.
+    @# reject_unknown_hostname value not recommended, because it may causes mail losting.
+    @# (for example: after paypal.com registration you don't receive activation mail! I've tried it.)
+    @#
+    smtpd_helo_restrictions = "permit_mynetworks, reject_invalid_hostname"
+    @
+    @#
+    @# against to open relay:
+    @#
+    smtpd_recipient_restrictions = "permit_mynetworks, reject_unauth_destination"
+    @
+     
 @## Limitation des messages envoyés par minute
 @# On n'ignore que les messages venant d'adresses "protégées"
 smtpd_client_event_limit_exceptions = local_networks