All LISTSERV requires is that the userid@host be 80 characters or less for a subscription. Otherwise I don't think there is a restriction of any kind (short of the usual SMTP restrictions) on the length of an address used to post. If there were a lot of those old X.400 addresses would have bounced :) It sounds like there is a non-LISTSERV related problem in getting mail to the server from that particular domain, given the symptoms you've reported. Nathan At 08:53 2002/12/03 -0500, you wrote: > Is there a limit on the size of an email address token that > Listserv will attempt? > > We have a case with an address, [log in to unmask] > can send messages to Listserv, but messages to the list go > unrecognized (no bounce or anything.) Using another shorter > address, for a different subscription, works fine. This person > can receive mail but cannot post. > > Thanks, > Jim Cocks - Louisville