-Users of the ssoma[1] command-line tool may import mail into an mbox,
-Maildir, or IMAP folder from git repositories periodically.
+Traditional mailing lists use the "push" model. For readers,
+that requires commitment to subscribe and effort to unsubscribe.
+New readers may also have difficulty following existing
+discussions if archives do not expose Message-ID and References
+headers. List server admins are also burdened with delivery
+failures.
+
+public-inbox uses the "pull" model. Casual readers may also
+follow the list via NNTP, Atom feed or HTML archives.