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.