We need a rubbish cleaner, gents. Orphan attachments removal tool from the server,call it as you like. I can attach files to a message , refresh the page then attach again, event if it's the same file, over and over, nothing is stopping me. Its become even easier with the new drag and drop functionality. All that attachment will stay on the HD. If one has own server with terrabite of HD this isn't a problem. But it can become a problem for others who pay for a hosting.