title: Jenkins Pipeline EmailExt: Who are the "Suspects Causing Build to Begin Failing"?
body: <p>In a Jenkins Pipeline job, when sending an email with the EmailExt plugin, one of the Recipient providers is "Suspects Causing the Build to Begin Failing".</p>
  
  <p>The class name for this provider is <code>FirstFailingBuildSuspectsRecipientProvider</code>.</p>
  
  <p>Who is this supposed to be in this list?  When I try using this provider, it sends no emails out.</p>