.IP
With the option \fB--no-online-registration\fR, the "register" right is
suppressed and users must be manually created by an administrator.
+.IP
+If online registration is desired then \fBmail_sender\fR must be set in the
+configuration file. See \fBdisorder_config\fR(5).
.TP
.B shutdown
Shut down the daemon.