tracking.html

<-- Inserir no body -->
<custom name="opencounter" type="tracking" />

unsubscribe.html

<table cellspacing="0" cellpadding="0"
    width="100%" role="presentation"
    style="mso-table-lspace:0pt;mso-table-rspace:0pt;border-collapse:collapse;border-spacing:0px">
    <tbody>
        <tr style="border-collapse:collapse;">
            <td align="left"
                style="padding:0;Margin:0;padding-top:5px;">
                <a href="%%unsub_center_url%%"
                    target="_blank"
                    style="text-decoration: none;"></a>
                <h6
                    style="Margin:0;line-height:24px;mso-line-height-rule:exactly;font-family:'Nunito', arial, 'helvetica neue', helvetica, sans-serif;font-size:11px;font-style:normal;font-weight:normal;color:#000000;text-align: center;">
                    <a href="%%unsub_center_url%%"
                        target="_blank"
                        style="text-decoration: none;">Caso
                        não queria receber
                        nossos e-mails, clique
                        aqui </a>
                </h6>
            </td>
        </tr>
    </tbody>
</table>

visualização.html

<table cellspacing="0" cellpadding="0" width="100%"
    role="presentation"
    style="mso-table-lspace:0pt;mso-table-rspace:0pt;border-collapse:collapse;border-spacing:0px">
    <tbody>
        <tr style="border-collapse:collapse;">
            <td align="left"
                style="padding:0;Margin:0;padding-top:5px;">
                <a href="%%view_email_url%%" target="_blank"
                    style="text-decoration: none;"></a>
                <h6
                    style="Margin:0;line-height:24px;mso-line-height-rule:exactly;font-family:'Nunito', arial, 'helvetica neue', helvetica, sans-serif;font-size:11px;font-style:normal;font-weight:normal;color:#000000;text-align: center;">
                    <a href="%%view_email_url%%" target="_blank"
                        style="text-decoration: none;">Caso não
                        esteja vendo as imagens, clique aqui
                    </a>
                </h6>
            </td>
        </tr>
    </tbody>
</table>