No, you can only access your saves from the same device and browser as the one you used to create the save. That’s just the way CJW’s plugin works. The dashingdon.com site does not retain or access any savegame data.
This is odd. I’ve checked your email myself and I cannot duplicate that error. It looks as if the @ symbol isn’t being recognized? Is there a reason that might be happening? Are you using non-US/UK input maybe?