From 76a28f993af3f75126174bcd81ddc4e18b89ca4e Mon Sep 17 00:00:00 2001
From: Moritz Poldrack <~git@mp.gy>
Date: Thu, 18 Jul 2024 07:52:44 +0000
Subject: [PATCH] Prevent Microsoft MUAs from sending reactions

No one in their right mind would want this, so we can probably just drop it.
---
 target/postfix/sender_header_filter.pcre | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/postfix/sender_header_filter.pcre b/target/postfix/sender_header_filter.pcre
index cc0a79ab..fe4ff045 100644
--- a/target/postfix/sender_header_filter.pcre
+++ b/target/postfix/sender_header_filter.pcre
@@ -8,4 +8,4 @@
 /^\s*X-Mailer/                      IGNORE
 /^\s*X-Originating-IP/              IGNORE
 /^\s*Received: from.*127.0.0.1/     IGNORE
-
+/^Content-Type:/i                   PREPEND X-MS-Reactions: disallow