I know this is an older post. But I just came across it looking for a solution. Instead of finding the solution on here, I accidentally discovered the solution on my own.
It's an extra step or two, but it gets the job done.
1.) Open the email with the embedded picture(s)
2.) Go to file>save as
3.) Save the email as an .HTML or .HTM file.
Wherever you saved the email. It will also create a folder in the name of the email subject line. In this folder are the images.
Hope this helped!