+You should moderate postings from non-subscribed addresses on your
+mailing lists, to prevent propagation of unwanted messages (``spam'')
+to subscribers and to the list archives. For lists controlled by
+Mailman, you can do this by setting @code{Privacy Options - Sender
+Filter - generic_nonmember_action} to @code{Hold}, and then
+periodically (daily is best) reviewing the held messages, accepting
+the real ones and discarding the junk.
+