title: Set a custom "forwarded" message to Mail Item via VSTO Outlook 2013 Plugin
body: <p>I am developing a VSTO Plugin for Outlook 2013 (or higher) that allows users to forward mail contents and sender/recipient data to some other program. The sending of mail data works great, I would however like to mark the mail in Outlook that I forwarded, so that the user can clearly see which mails were forwarded. </p>
  
  <p>I have tried several options, which worked for me, but the end result is not quite what I would like. </p>
  
  <p>For example: </p>
  
  <ul>
  <li>I can set a category for the mail with a custom text "Mail forwarded
  to XY"  </li>
  <li>I can set one of the Outlook Icons as the symbol (<code>PidTagIconIndex</code>)</li>
  </ul>
  
  <p>One option I didn't try yet is creating a <code>custom Form</code> and I would like to avoid that option if possible. </p>
  
  <p>What I would like to do is set something like this (sorry for the german screenshot): </p>
  
  <p><a href="https://i.stack.imgur.com/EvSMw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EvSMw.png" alt="enter image description here"></a></p>
  
  <p>This text appears when I forward a mail to some other recipient in Outlook. Is it possible to set this programatically (with C#) - if possible with custom text? </p>