social/mail_debrand/views/mail_notification_view.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo noupdate="1">

    <template id="message_notification_email" inherit_id="mail.message_notification_email" priority="99">
        <xpath expr="//div/p[last()]" position="replace" >
            <p style="color: #555555; margin-top:32px;">
                Sent by
                <a t-if="website_url" t-att-href="website_url" style="text-decoration:none; color: #875A7B;">
                    <span t-esc="company.name"/>
                </a>
                <span t-if="not website_url" t-esc="company.name"/>
            </p>
        </xpath>
    </template>

    <!-- Replaces Powered By on these notifications -->
    <template id="mail_notification_borders" inherit_id="mail.mail_notification_borders" priority="99">
        <xpath expr="//tr[last()]" position="replace" />
    </template>

    <template id="mail_notification_light" inherit_id="mail.mail_notification_light" priority="99">
        <xpath expr="//tr[last()]" position="replace" />
    </template>

    <template id="mail_notification_paynow" inherit_id="mail.mail_notification_paynow" priority="99">
        <xpath expr="//tr[last()]" position="replace" />
    </template>

</odoo>