From 00745456fe7b9df152ef6ae5f04ec2c8df59fa81 Mon Sep 17 00:00:00 2001
From: ale <ale@incal.net>
Date: Sat, 30 Nov 2019 20:51:48 +0000
Subject: [PATCH] postfix: Do not perform reverse lookups of internal hosts

---
 roles/mail/templates/postfix-out/main.cf | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/roles/mail/templates/postfix-out/main.cf b/roles/mail/templates/postfix-out/main.cf
index 71672235..df1b16d0 100644
--- a/roles/mail/templates/postfix-out/main.cf
+++ b/roles/mail/templates/postfix-out/main.cf
@@ -32,6 +32,9 @@ local_transport = error:5.1.1 Mailbox unavailable
 smtpd_relay_restrictions =
 smtpd_recipient_restrictions = permit_mynetworks, reject
 
+# Disable DNS lookups, only internal hosts talk to us.
+smtpd_peername_lookup = no
+
 # Tolerate occasional high latency in the  content filter.
 smtpd_timeout = 1200s
 
-- 
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