I understand the problem, and have had it myself on several lists.
Since I train many people on using LISTSERV and related list managers
they run across on the nets, I tell them to NEVER use the TELL command
to sign up to a list.  Whether Bitnet lives or dies, the TELL command
is counterproductive to teach people, at least as regards to using it
to sign up for lists.
 
Mailing to LISTSERV@somewhere will always work, and the format works
for mailserv, listserv(clones), listname-request@smoeplace, and other
variants they may run across.
 
Of course the hardest person to teach this to has been me, since my
habits have been ingrained for longer than most of those I teach.  o-)
 
dan
 
  Dan Lester                          Internet: [log in to unmask]
  Network Information Coordinator     Bitnet:   ALILESTE@IDBSU
  Boise State University Library
  Boise, Idaho  83725                 In the kingdom of the blind, the
  208-385-1235                        one-eyed man is king.  Erasmus. 1523