INFO-MAC is a special case: the digests for this list are not prepared by
LISTSERV, instead  each individual message  posted by the moderator  is a
digest. I also assume  that the archives are set up  so that each message
(digest)  is  archived in  a  separate  file.  The  result is  that  each
individual  retrievable  file  happens  to  be a  digest  that  could  be
processed  by  the mail  system  if  delivered  "as  is" to  the  mailer.
Normally,  there  are  several  messages  in  each  weekly/monthly/yearly
archive  file, and  with the  GET command  you can  only order  the whole
archive file (the database functions  let you extract specific messages).
A typical archive  file cannot be processed directly by  the mail system,
because it does not start with a mail header and is not in digest format.
In general, LISTSERV files are not resendable mail files, and this is why
LISTSERV generates its own headers.
 
  Eric