Iphone images not consistently saved

I'm trying to figure out why iphone images are not consistently working with mail to image. Unfortunately I don't have an iphone to test with.

Here's what I've noticed:

Using mac.com images are not detected. The email becomes a blog post.

One users images were working when he was in New Jersey, but not in Nevada.

If I receive the iphone emails with images on a gmail account and then forward to my server's account, the images are detected and converted to image nodes.

I would appreciate any suggestions.

Thanks