When a user subscribes to a list, his net-address is taken "automatically" from the mail header, or from the message received at LISTSERV etc., so the address IS correct (at least at the time the message was SENT to LISTSERV). However, when one tries to add people to LISTSERV, no checking at all is done, and the only "sign" for a bad address are the rejection messages (and if QUIET ADD was used, we have to wait to the first mailing to be bounced back). I think that it should not be a big thing to have LISTSERV check if an ADDed userid actually exists (trivial if the address is local, also possible if the added userid is on another node running LISTSERV). I am aware that my suggestion does not handle ADD requests to sites not running LISTSERV, and that it does not handle "legal" typos (e.g. - I ADDed ABCD0 instead od ABCDO, but both are existing userids on that node). Still - I believe that if implemented it would enable to reduce error messages and give better service. Comments ? Better ideas ? Eric - are you willing to add that to the code? Does it really involve just a bit of work ? /Zvika