diff --git a/SoObjects/Appointments/SOGoAptMailICalReply.h b/SoObjects/Appointments/SOGoAptMailICalReply.h
index 539966932b..42805cb3b3 100644
--- a/SoObjects/Appointments/SOGoAptMailICalReply.h
+++ b/SoObjects/Appointments/SOGoAptMailICalReply.h
@@ -1,8 +1,6 @@
 /* SOGoAptMailICalReply.h - this file is part of SOGo
  *
- * Copyright (C) 2007 Inverse inc.
- *
- * Author: Wolfgang Sourdeau <wsourdeau@inverse.ca>
+ * Copyright (C) 2007-2020 Inverse inc.
  *
  * This file is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
diff --git a/SoObjects/Appointments/SOGoAptMailICalReply.m b/SoObjects/Appointments/SOGoAptMailICalReply.m
index e8ebaf0c96..8e51214fb7 100644
--- a/SoObjects/Appointments/SOGoAptMailICalReply.m
+++ b/SoObjects/Appointments/SOGoAptMailICalReply.m
@@ -1,8 +1,6 @@
 /* SOGoAptMailICalReply - this file is part of SOGo
  *
- * Copyright (C) 2010-2012 Inverse inc.
- *
- * Author: Wolfgang Sourdeau <wsourdeau@inverse.ca>
+ * Copyright (C) 2010-2020 Inverse inc.
  *
  * This file is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
diff --git a/SoObjects/Appointments/SOGoAptMailNotification.m b/SoObjects/Appointments/SOGoAptMailNotification.m
index 90a1710408..e95de69d03 100644
--- a/SoObjects/Appointments/SOGoAptMailNotification.m
+++ b/SoObjects/Appointments/SOGoAptMailNotification.m
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2006-2019 Inverse inc.
+  Copyright (C) 2006-2020 Inverse inc.
   Copyright (C) 2000-2005 SKYRIX Software AG
 
   This file is part of SOGo.
diff --git a/SoObjects/Appointments/SOGoCalendarComponent.m b/SoObjects/Appointments/SOGoCalendarComponent.m
index 846c09a933..9b34b493eb 100644
--- a/SoObjects/Appointments/SOGoCalendarComponent.m
+++ b/SoObjects/Appointments/SOGoCalendarComponent.m
@@ -981,7 +981,8 @@ - (void) _sendIMIPReplyForEvent: (iCalRepeatableEntityObject *) event
   [headerMap setObject: @"1.0" forKey: @"MIME-Version"];
 
   if (textOnly)
-    [headerMap setObject: @"text/html" forKey: @"content-type"];
+    [headerMap setObject: @"text/html; charset=utf-8"
+                  forKey: @"content-type"];
   else
     [headerMap setObject: @"multipart/mixed" forKey: @"content-type"];