title: Keeping Email Message from Grouping into Conversation View in Gmail
body: <p>I'm working on a feature for a client to send them email updates whenever a specific event occurs on their site.  When the message shows up in Gmail, the messages get grouped together in conversation view even through they aren't the same conversation.  It appears that this is due to the fact that <a href="https://webapps.stackexchange.com/q/16095/35772">Gmail groups based only on the subject</a>.  The client is adamant that we not change the subject line (don't get me started).</p>
  
  <p>Does anyone know how I can disable this by sending a special header in the mail or am I out of luck?</p>