Why was my email leaked?
I also give out a separate email address to every service I sign up for.  So far geico, mint, and dyndns have lost or sold my email address.  I haven't gotten any spam on my dropbox account, but I've only had an account since 2012-10-02.I don't run any spam filtering, at all, and my email box is the catchall for my domain.  These aren't just lucky guesses.