11:  How do I unsubscribe from this mailing list?

  If you are receiving a GNU mailing list named "XXX", you might be able to
  unsubscribe from it by sending a request to the address
  <XXX-request@prep.ai.mit.edu>.  However, this will not work if you are
  not listed on the main mailing list, but instead receive the mail from a
  distribution point.  In that case, you will have to track down at which
  distribution point you are listed.  Inspecting the "Received:" headers on
  the mail messages may help, along with liberal use of the "EXPN" or
  "VRFY" sendmail commands through "telnet <site-address> smtp".  Ask your
  postmaster for help.