I don't know how widespread this is, but at least a couple of academic sites with multiple subscribers to lists I manage have recently stopped delivering mail to "long-form" addresses -- i.e., mail addressed to (using my address as an example) [log in to unmask] simply comes back with an error message saying there are "no users at that domain; shortform addresses only." I suspect the users haven't been notified that their addresses have changed to (in my case) [log in to unmask], or haven't understood the notification. I wind up manually changing all the addresses at that location. I've been told this may be part of the local postmaster trying to make spam and virus filtering more efficient, though I have to say I don't understand why that would be. Two questions: (1) is anybody else encountering this? and (2) why, for days after I've changed the address, do I still get error messages from listserv saying that user (under the old long-form address) is being monitored? -- Russ St. Thomas University http://www.StThomasU.ca/~hunt/