From 0f52f638630da66fc58c7e3f6ff639abd9388666 Mon Sep 17 00:00:00 2001
From: Alexander Krotov <ilabdsf@gmail.com>
Date: Fri, 17 Jan 2020 01:49:30 +0300
Subject: [PATCH] Add "Auto-Submitted: auto-replied" header to MDNs

This header is specified in RFC 3834.
---
 src/mimefactory.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/mimefactory.rs b/src/mimefactory.rs
index 258f07710..aeafb8062 100644
--- a/src/mimefactory.rs
+++ b/src/mimefactory.rs
@@ -401,6 +401,13 @@ impl<'a, 'b> MimeFactory<'a, 'b> {
         ));
         unprotected_headers.push(Header::new("Chat-Version".to_string(), "1.0".to_string()));
 
+        if let Loaded::MDN = self.loaded {
+            unprotected_headers.push(Header::new(
+                "Auto-Submitted".to_string(),
+                "auto-replied".to_string(),
+            ));
+        }
+
         if self.req_mdn {
             // we use "Chat-Disposition-Notification-To"
             // because replies to "Disposition-Notification-To" are weird in many cases