title: How to get the BUILD_USER in Jenkins when job triggered by timer?
body: <p>I wanted to show the user who triggered a Jenkins job in the post job email. This is possible by using the plugin <em>Build User Vars Plugin</em> and the env variable <code>BUILD_USER</code>.
  But this variable do not get initialized when the job is triggered by a scheduler.</p>
  
  <p>How can we achieve this? I know we have a plugin called - EnvInject Plugin, and that can be used...</p>
  
  <p>But I just want to know how we can use this and achieve the solution...</p>