title: Prevent Gmail Threaded Conversation on Notification emails
body: <p>This question is the opposite of <a href="https://stackoverflow.com/questions/372449/header-in-gmail-for-thread-hinting">Header in gmail for thread hinting</a></p>
  
  <p>I have a system that generates notifications for various things. A lot of these have the same subject line, but different content.</p>
  
  <p>Is there anyway short of adding some kind of unique token in the subject line of forcing the emails to NOT be in the same thread, i.e. show up individually. Changing headers and/or content would be acceptable, but changing the subject line will scare people. Also, not all of the recipients are Google Apps/@gmail.com accounts so I can't use things like "+hash".</p>
  
  <p>If it matters, the application is written in C# and ASP.Net.</p>
  
  <p>Anyone know how to do this?</p>