+=item publicinbox.wwwlisting
+
+Enable a HTML listing style when the root path of the URL '/' is accessed.
+Valid values are:
+
+=over 8
+
+=item all
+
+Show all inboxes
+
+=item 404
+
+Return a 404 page. This is useful to allow customization with
+L<Plack::App::Cascade(3pm)>
+
+=item match=domain
+
+Only show inboxes with URLs which belong to the domain of the HTTP
+request
+
+=for TODO comment
+
+support showing cgit listing
+
+=back
+
+Default: 404
+