title: Sending email on behalf of another user
body: <p>Currently I have used GMail API (OAuth Credential for Web) to read and send email messages. How can we send email on behalf of another user (i.e. noreply@example.com)? </p>
  
  <p>In enterprise application, do we need to use service account for reading specific user's mail labels, messages and send email on behalf of that user?  </p>