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

<data priority="50">
    <xpath expr="//body[1]/div[1]/div[1]" position="before">
        <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"/>
    </xpath>
</data>