Years ago I wrote an article on setting up a blind drop FTP server I was searching for some information and ran across an updated article using FTP 7.5. Funny thing I recently setup a blind drop using FTP 7.5 and referred to my article on permissions.
btw - here is a Blind Get, I've not tried on FTP 7.5, the permissions should be similar.
Hope this helps
Microsoft MVP - IIS