server-tools/fetchmail_notify_error_to_sender/data/email_template_data.xml

<?xml version="1.0" ?>
<odoo noupdate="1">
    <!--Email template -->
    <record id="email_template_error_notice" model="mail.template">
        <field name="name">Fetchmail - error notice</field>
        <field name="email_from">${ctx.get('sender_message').get('to')|safe}</field>
        <field name="email_to">${ctx.get('sender_message').get('from')|safe}</field>
        <field name="subject">Receiving error with: ${ctx.get('sender_message').get('subject')|safe}</field>
        <field name="model_id" ref="fetchmail.model_fetchmail_server"/>
        <field name="auto_delete" eval="True"/>
        <field name="user_signature" eval="True"/>
        <field name="lang">${ctx.get('lang')}</field>
        <field name="body_html"><![CDATA[
            <div>
            <p>Hello ${ctx.get('sender_message').get('from')},</p>
            <p>we got a problem with your email: <i>${ctx.get('sender_message').get('subject')}</i></p>
            <p>Maybe you used a wrong recipient address?</p>
            <p><br/></p>
            <p>Technical details:</p>
            <p><i>${ctx.get('route_exception')}</i></p>
            </div>
        ]]></field>
    </record>
</odoo>