Just in case anyone is interested, the eDUcore has a disk-based MOOmail system. Not sure how independent it is from the rest of the eDUcore (which started as a pre-95 Lambda, I think), but might be worth a try...For more info, see http://www.du.org/educore/eDUcore_features.html, or ask me for more info. (I'm a core wiz on an eDUcore-based MOO, so I know it fairly well, except for the WEB part.)