ADD is  (and must be) case  sensitive. If the user  is already subscribed
under  an equivalent  address, you  get  a warning.  LISTSERV can't  know
whether you sent  the command twice by mistake, or  wanted to correct the
subscription because  the old address was  in the wrong case.  So it just
adds the user  tells you to check  it out. Commands like  SET only affect
the address that  is closest to the  one you type, otherwise  it would be
impossible  to register  a  user  under (say)  both  Internet and  BITNET
addresses with  one of the two  addresses set to NOMAIL.  DEL and SIGNOFF
removes  anything that  matches. So  the only  way you  can get  yourself
subscribed twice to a list  under slightly different addresses is through
the help of the list owner.
 
  Eric