title: How to identify emails sent by humans?
body: <p>I am working on a project, where I need to identify emails sent by real humans as opposed to bulk mails, notifications and newsletters. Is there any definite way of doing that? Is there any information in email header which can help. I am working on top of Gmail IMAP so I already have non-spam emails.</p>
  
  <p>Any help in this regard is appreciated. Thanks!</p>