At 11:58 4/28/98 -0400, BRIAN MC NAMARA said:
|I seem to have a pretty annoying problem.  for some strange reason, an
|owner of a discussion group that I house, has YAHOO internet address and
|for some reason, everything that she posts get returned to her with an
|unknown list message. (...)

Please provide a copy of one such bounce complete with all RECEIVED line
headers.  All else is speculation.