Imagem de fundo em e-mails com código para Outlook

exemplo-outlook.html

<table border="0" cellpadding="0" cellspacing="0" width="640">
  <tr>
    <td align="center" bgcolor="#bada55" background="path/to/file.jpg"
      style="background-color: #bada55; background-image: url(path/to/file.jpg);">
      <!--[if gte mso 9]>
        <v:rect xmlns:v="urn:schemas-microsoft-com:vml" fill="true"
          stroke="false" style="width: 640px; height: 400px;">
        <v:fill type="tile" src="path/to/file.jpg" color="#bada55" />
        <v:textbox style="mso-fit-shape-to-text:true" inset="0,0,0,0">
      <![endif]-->

      <!-- content goes here -->

      <!--[if gte mso 9]>
        </v:textbox>
        </v:rect>
      <![endif]-->
    </td>
  </tr>
</table>