Lately I have been getting spam from Dropbox.  I did some research and found it could be a government plot.  I have just been deleting the emails and sending then to spam.  So if anyone gets a dropbox email you should just delete it asap, probably without opening it.

Maybe you should seek advice from Scully and Molder with this topic

wear tin foil gloves while deleting and sending to spam ? can't be to careful y'know....