From 716884ef5d34f11e8e749b92b9d8e0217f83f133 Mon Sep 17 00:00:00 2001
From: M66B <M66B@users.noreply.github.com>
Date: Wed, 15 Dec 2021 19:57:55 +0100
Subject: [PATCH] Revert "Return-Receipt-To is non standard"

This reverts commit f8eec8fe195ab5051fc07f6b3f204f65d184b9ec.
---
 app/src/main/java/eu/faircode/email/MessageHelper.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/app/src/main/java/eu/faircode/email/MessageHelper.java b/app/src/main/java/eu/faircode/email/MessageHelper.java
index d9fdf93f3a..63f90ea5e9 100644
--- a/app/src/main/java/eu/faircode/email/MessageHelper.java
+++ b/app/src/main/java/eu/faircode/email/MessageHelper.java
@@ -402,6 +402,11 @@ public class MessageHelper {
                 // 1=Delivery receipt
                 // 2=Read+delivery receipt
 
+                // defacto standard
+                if (receipt_type == 1 || receipt_type == 2) // Delivery receipt
+                    imessage.addHeader("Return-Receipt-To", to);
+
+
                 // https://tools.ietf.org/html/rfc3798
                 if (receipt_type == 0 || receipt_type == 2) // Read receipt
                     imessage.addHeader("Disposition-Notification-To", to);