Question : Embedded images not showing in emails for internal users

I am sending out HTML emails using Constant Contact.  These emails are going to recipients within my domain as well as recipients external to my domain.  All internal recipients cannot download embedded images, and all external recipients can download the images.

Internal recipients receive the message with image placeholders with red "x" in the corner, and when the user clicks the bar at the top of the email display window that is supposed to allow the images to be downloaded and displayed, the placeholders disappear, and no images are displayed.  

External recipients can download the embedded images.

I need all recipients to be able to download embedded images.

Answer : Embedded images not showing in emails for internal users

As it turns out, the spam defender was replacing the image files with clear pixels.