We are aware of the issue with the badge emails resending to everyone, we apologise for the inconvenience - learn more here.
I believe that Dropbox is a very good application, but I think they should implement something it lacks, which is that when you share a file and disable downloads for viewers, you cannot activate "off...
Walter
Dropbox Staff
Dropbox StaffHi Boni di, would the Send and Track feature work for what you had in mind perhaps?