Gary,
 
On LISTSERV 191 you will find a file called $DEFAULT MAILFORM. Get a copy
of it, rename it to 'listname MAILFORM' and extract the mail form located
at the bottom and called $SIGNUP (ie delete everything else in the file).
You can then customize this mailform as desired - the control language is
fairly easy to understand (.bb/.eb  mark conditional sections, .fo on/off
is  like in  SCRIPT, etc).  What you  have to  remember is  that anything
INSIDE  quotes  gets evaluated  with  a  REXX "Interpret"  statement  and
substituted. If  you need to  put a quote in  the text, for  a possessive
case for  example, you  must double  it. If  you really  want to  send an
actual file  to the new subscriber,  it will be more  complicated because
you do  not know who is  being added to  the list ($SIGNUP is  a mailform
which is  imbedded in the mailforms  for the ADD and  SUBSCRIBE commands,
which are  slightly different of course).  You could probably do  it with
something like this:
 
.do Call LSVSENDF Word(destination,1),FILEID
 
That relies on the  fact that the person being added  is always the first
name in the list of recipients.
 
  Eric