David Dyer-Bennet wrote: <snip from here> > Nope, we don't want to do that. Perfectly possible, though, just to > avoid dodging the technical question. > > Subject is not the best thing to use for sorting the messages into > separate folders. You should use the List-Id: header. Ok not that I am arguing for any change just that while list-id or even to fields are quite nice solutions technically, they don't do what he wanted which was to allow him to sort list related email, including those email that are off-list but generated by a list email, which of course wouldn't have the header you alluded to. Mind you munging subject lines isn't nessacarily going to fix that either. Andrew.