From f458792fe6e11d57f5f1f3ac7f0e1ac6948624c8 Mon Sep 17 00:00:00 2001
From: Steve Freegard <steve@stevefreegard.com>
Date: Tue, 26 Apr 2016 12:45:28 +0100
Subject: [PATCH] Update MULTIPLE_UNIQUE_HEADER to include RFC5322 rules

---
 rules/misc.lua | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/rules/misc.lua b/rules/misc.lua
index 728b694cd1..a9b5fd94dd 100644
--- a/rules/misc.lua
+++ b/rules/misc.lua
@@ -209,8 +209,18 @@ rspamd_config.HEADER_FORGED_MDN = {
 local headers_unique = {
   'Content-Type',
   'Content-Transfer-Encoding',
+  -- https://tools.ietf.org/html/rfc5322#section-3.6
   'Date',
-  'Message-ID'
+  'From',
+  'Sender',
+  'Reply-To',
+  'To',
+  'Cc',
+  'Bcc',
+  'Message-ID',
+  'In-Reply-To',
+  'References',
+  'Subject'
 }
 
 rspamd_config.MULTIPLE_UNIQUE_HEADERS = {
-- 
2.47.3