In the vast majority of cases, list owners aren't sending DELETE commands
to  delete the  BITNET  form  of someone's  dual  subscription; they  are
sending a DELETE  command to get someone off the  list, completely. Often
the request comes from  the user in the form of a  mail message asking to
be  removed from  the  list. The  mail message  is  usually the  Internet
address, and the subscription is often a BITNET address, but the opposite
is also  possible. This is  why the  DELETE command removes  ALL matching
addresses,  and tells  you so.  If it  worked otherwise,  you would  then
complain that DELETE is not working as  it should :-) As Peter said, dual
subscriptions are  not normally possible.  You need a situation  like the
one  he describes,  where  the  two subscriptions  were  made before  the
addition of a :internet tag, to get the problem you are experiencing.
 
  Eric