Embedding images into html emails

I am aware of how to use an external website to embed an image, but I was hoping to host the images on one of our servers.

I tried putting the image I wanted to use next to the OOB HP logo and used the image properties as a guide: {http_url}/images/Icon_Logo.png. I found this image on our all three of our SM servers all using the same file path ex: D:\Tomcat8\webapps\webtier-9.50\images

However, the image will not display.