hi cONR. that sounds weird.
Let me ask you, when you receive the images in the email, what exactly happens when you try to view it? What error message do you get? It's possible that your email program won't display the image or your image viewer wont (if you have a verrrrrrrrrrrrrrrrrrrrrry old computer).
Try this, send one to me (firstname.lastname@example.org), and i'll tell you if it sends ok.