From a7380f6832fb1e41e27692da9691effdab717d0e Mon Sep 17 00:00:00 2001
From: Pierre Jaury <pierre@jaury.eu>
Date: Tue, 1 Nov 2016 11:53:19 +0100
Subject: [PATCH] Add a strong restriction on non-existent senders

---
 postfix/conf/main.cf | 1 +
 1 file changed, 1 insertion(+)

diff --git a/postfix/conf/main.cf b/postfix/conf/main.cf
index 09391e21..f43f2531 100644
--- a/postfix/conf/main.cf
+++ b/postfix/conf/main.cf
@@ -105,6 +105,7 @@ smtpd_sender_restrictions =
    permit_mynetworks,
    reject_non_fqdn_sender,
    reject_unknown_sender_domain,
+   reject_unlisted_sender,
    reject_sender_login_mismatch,
    permit