1. Depending on your email client, you may have to click a link that says “display images” or something similar.
2. Check that the message is being displayed in HTML.
3. If you still can’t see the image, try to view the source of the message, and find the html tag <img source=”http://…” and copy and past the http://… part into the browser, and see if the image is displayed, if not then the link is dead, if it is, then there is still some setting that is incorrect in your email client.