http://mako.cc/copyrighteous/google-has-most-of-my-email-because-it-has-all-of-yours

Despite the fact that I spend hundreds of dollars a year and hours of work to host my own email server, Google has about half of my personal email! Last year, Google delivered 57% of the emails in my inbox that I replied to. They have delivered more than a third of all the email I’ve replied to ever year since 2006 and more than half since 2010.