Odoo-Build/snippets/mail.mail_notification_layout.embed_logo.xml

<data inherit_id="mail.mail_notification_layout" priority="50">
    <img position="replace">
        <img
            t-att-src="'data:image/png;base64,%s' % (company.logo_web.decode('utf-8'))"
            style="padding: 0px; margin: 0px; height: auto; max-width: 200px; max-height: 36px;"
            t-att-alt="'%s' % company.name"
        />
    </img>
</data>