title: GitLab email setup: sending via another mail server
body: <p>By default gitlab has the next configuration in <code>gitlab.yml</code> :</p>
  
  <pre><code>email:
    from: notify@gitlabhq.com
    host: gitlabhq.com
  </code></pre>
  
  <p>but, I need to specify other variables (host, port, user, password, etc) to use another mail server.</p>
  
  <p>How I do that? </p>