+.PP
+The
+.B \-build
+switch is intended to be used by the Emacs mh-e interface to
+.BR nmh .
+It implies
+.BR \-nowhatnowproc .
+It causes a file <mh\-dir>/draft to be created, containing the draft message that
+would normally be presented to the user for editing.
+No mail is actually sent.