Gmail. Got the newsletter, but the demo code isn't showing up. Other methods that I tried to view it give a 404 error.
That's what's in my email. WTH?
EDIT: Trying to view the image in the browser gives this:
I had the same issue, however I just keep reloding the e-mail like for 30 minutes and it display after all those reloads.
Edit:Also log in from your mobile that helps too.