+The
+.B \-from
+switch can, and should, be used to specify the sender's mailbox (name
+and email address). Alternatively, the
+.B PERSON
+environment variable can be used for the same purpose.
+If neither is used,
+.B sendfiles
+will supply a \*(lqFrom:\*(rq header field using the sender's local
+mailbox, see
+.I localmbox
+in
+.IR mh-format (5).
+.PP
+The remaining command line switches select the compression program.
+One of these can be used to override the run-time determination of
+the compression program by
+.BR sendfiles .
+.PP