Update
What is allowed is to link to a large image with a URL (no IMG tags allowed) as long as you also attach the same image as an attachment. That image that you attach will then be smaller, but make sure you post a descent size. So linking with a URL to a very large image and attaching an image with the size of a post stamp is of course is of course not the proper way.
This original thread is now 1 week old and I assume most people read it, so as of tomorrow this rule will be in effect. Again, I hate "rules" but for reasons mentioned earlier I think they serve the community best in the long run.
Thanks.