Experts are debating whether the Democratic National Committee’s (DNC) email system was hacked by the Russian military intelligence service (G.R.U.) or Guccifer 2.0, a lone wolf Romanian hacker. While this is a very important question, the answer will not change the results: over 20,000 DNC emails ended up on WikiLeaks. How did this happen? How likely is it to happen to you or your company? What can you do to protect your email system from a similar fate?