Right but grepping for "+" in emails is also high on the list of things I'd do to identify an unknown information dump. Given that he's used to dealing with tho

Right but grepping for "+" in emails is also high on the list of things I'd do to identify an unknown information dump. Given that he's used to dealing with those I'd be surprised if he hadn't thought of that, although it probably doesn't hurt asking him if he did try it.