Right click on the box with the red x, choose properties and see what it points to. See if you can find any difference between photo's that DO show and photo's that DON'T show.
Could be file type (.jpg) or location (url, folder it's in).
Post your findings.
Some emails that I receive do not display the photo that is sent - a outlined box with a red x is displayed. What settings do I have to change for these to appear.
Thanks for any help.