title: How to embed an image into an Outlook HTML email message?
body: <p>We have a Winforms application which supports dragging and dropping chunks of HTML into Outlook (HTML) mail messages.</p>
  
  <p>Chunks of text are fine.</p>
  
  <p>But how do we proceed with images? Let's assume we don't want to host the images online but instead we want to send them with the email message. Assume also that we do want to see the image inline, not as an attachment (where the recipient's email client supports that, of course).</p>
  
  <p>If you look at the HTML source of an Outlook message there are "cid" tags for images (which point to the image as an attachment I guess), but how do we go about generating a cid/contentid?</p>