title: Using "Open Sans" font without Google Fonts in Emails
body: <p>I have a doubt, the font open-sans is a safe font for use without google fonts?</p>
  
  <p>I can't use an external link, how:</p>
  
  <pre><code>&lt;link href='https://fonts.googleapis.com/css?family=Open+Sans' rel='stylesheet' type='text/css'&gt;
  </code></pre>
  
  <p>I need to use only the font-family declaration:</p>
  
  <pre><code>font-family: 'Open Sans', Arial, sans-serif;
  </code></pre>