9:   Where can I get old postings to gnu.emacs.help and other GNU groups?

  The FSF has maintained archives of all of the GNU mailing lists for many
  years, although there may be some unintentional gaps in coverage.  The
  archive is not particularly well organized or easy to retrieve individual
  postings from, but pretty much everything is there.  The archive is
  available at
   
    ftp://prep.ai.mit.edu/pub/gnu/MailingListArchives/