title: How to user erlang gen_smtp to send html-formatted email?
body: <p><code>gen_smtp</code> can be found <a href="https://github.com/Vagabond/gen_smtp" rel="nofollow noreferrer">here</a></p>
  <p>What I want is to let the content of email supports HTML tag, such as <code>&lt;strong&gt;Hello&lt;/strong&gt;</code></p>
  <p>Will display as <strong>Hello</strong>.</p>