hylafax probelm

Hello, I have here HylaFAX up and running. After I receive a fax a mail is send with a link to (ftp://tamboti:4559/recvq/fax00001.tif) the actuall fax. The fax itself has got the rights 640 uucp.uucp and I can manually view the faxes. But when I use the ftp link than I get the answer that the file can't be opend - when I change the rights to 644 uucp.uucp everything works. But I don't want to set the viewing right for everybody - what do the expert say? What Do I need to change? It does not make a difference when I used "users" as the group, and my test user is in the group uucp. Thanks Michael