Sample email message used in this article:https://salsasupport.zendesk.com/entries/45015100-Sending-an-email-blast-with-the-API

sample_email_message.html

<p>Hello, [[First_Name]]!</p>
<p>Once again, we're asking our supporters to reach out to their friends and
  <a href="https://wfc2.wiredforchange.com/o/8564/p/salsa/donation/common/public/?donate_page_KEY=8237">
    <i>help mules around the world.</i>
  </a>
</p>
<p>Regards,</p>
<p>The Management</p>