I suppose email "undo" is a useful feature. Not sure -- maybe it's one of those great ideas which looks a bit lame at first. Gmail handles outgoing attachments

I suppose email "undo" is a useful feature. Not sure -- maybe it's one of those great ideas which looks a bit lame at first. Gmail handles outgoing attachments really well. If you type text like "here's the file I promised" or "I've attached a file" it prompts you if you don't, in fact, attach a file.