We are aware of the issue with the badge emails resending to everyone, we apologise for the inconvenience - learn more here.
While having the Dropbox app running, then right-click on a folder/file and add a date/time notification related to that folder/file.
E.g. I get a mail April 4th, that I need to report statistics by November 20th. I save the document containing login links to the site and additional information. I then right-click the document and add a reminder for November 15th.
I know there are many, many ways to do the same thing e.g. copying the link to the file and add it in the calendar etc.
But above would be making it really, really easy.
Oh, and a calendar view showing future notifications
