Well, I came looking to see the results of my posting that there was no change to post#1, and am glad to see it was responded to in a positive way, the struck-out text. Now Kae, (amazingly we signed up 12 days apart in 2005) I have (almost) always had problems with HTML Emails on webmail old and beta. Once in a while one comes thru as a readable page. I think it's MOSTLY images in-line where there's problems, and that is addressed in POST#1 by TrevorB.
I tried changing options but would never find a solution. Instead of blank, I get a page full of machine code gibberish. I think it's just a limitation of using webmail. Post here or a PM if you learn why things don't come thru. (I can't look at your link, it want's me to log in to email, yours?)