From 2cf77b6145c0e35ff984cf1f8c51bd3d0b08977e Mon Sep 17 00:00:00 2001
From: Francis Lachapelle <flachapelle@inverse.ca>
Date: Fri, 8 Apr 2022 11:21:48 -0400
Subject: [PATCH] fix(mail): force TNEF body parts to be decoded in UTF-8

---
 SoObjects/Mailer/SOGoTNEFMailBodyPart.m | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/SoObjects/Mailer/SOGoTNEFMailBodyPart.m b/SoObjects/Mailer/SOGoTNEFMailBodyPart.m
index 997f6847f..b76104fdd 100644
--- a/SoObjects/Mailer/SOGoTNEFMailBodyPart.m
+++ b/SoObjects/Mailer/SOGoTNEFMailBodyPart.m
@@ -825,8 +825,14 @@ unsigned char GetRruleMonthNum(unsigned char a, unsigned char b) {
   ASSIGN (part, newPart);
   if (newPart)
     {
+      NSMutableDictionary *info;
+
+      info = [NSMutableDictionary dictionaryWithDictionary: [newPart bodyInfo]];
+      if ([newPart encoding])
+        [info setObject: [newPart encoding]
+                 forKey: @"encoding"];
       [self setFilename: [[newPart bodyInfo] filename]];
-      [self setPartInfo: [newPart bodyInfo]];
+      [self setPartInfo: info];
     }
   else
     {
@@ -884,6 +890,10 @@ unsigned char GetRruleMonthNum(unsigned char a, unsigned char b) {
   [map setObject: [NSString stringWithFormat: @"%@/%@", _type, _subtype]
           forKey: @"content-type"];
 
+  // Encoding
+  [map setObject: @"utf-8"
+          forKey: @"content-transfer-encoding"];
+
   /* prepare body content */
 
   content = [NSData dataWithBytes: [_data bytes] length: [_data length]];