Google has clarified its email scanning practices in a terms of service update, informing users that incoming and outgoing emails are analysed by automated software.The revisions explicitly state that Google’s system scans the content of emails stored on Google’s servers as well as those being sent and received by any Google email account, a practice that has seen the search company face criticism from privacy action groups and lawsuits from the education sector.
http://www.theguardian.com/technology/2014/apr/15/gmail-scans-all-emails-new-google-terms-clarify