title: How ansible callbacks are configured
body: <p>I have scoured the ansible documentation as well as a few books, google and the source code, but for the life of me I cannot find the answer to this simple question:</p>
  
  <p>How does one change the configuration items that affect the beahavior of ansible callbacks?</p>
  
  <p>-E.g: the mail callback appears, looking at the code, to be able to be configured to send mail to a configurable email address through a configurable SMTP host. How/where/when should these be specified?</p>
  
  <p>TIA</p>
  
  <p><strong>Edit:</strong> </p>