title: Email management design
body: <p>I am trying to design a simple email management system for my application. </p>
  
  <p>I get a problem managing the "Reply to" feature .
  Declaring a mail message object and its to, cc, bcc list is simple , but when replying to the message , I need away to handle the relationship with all the messages which were replied on the original message .</p>
  
  <p>id there any free system or datamodel doing this .
  Thanks in advance </p>