-rw------- 1 uucp uucp 445 Jun 3 16:27 hosts.hfaxd
So, just chmod 0600 hosts.hfaxd and chown uucp.uucp hosts.hfaxd.
Note: It's expected that a user login have been added to hosts.hfaxd using faxadduser command. For more information read man faxadduser.