social/mail_notify_bounce/views/fetchmail_view.xml

<?xml version="1.0"?>
<odoo>
    <record id="view_email_server_form_bounce_address" model="ir.ui.view">
        <field name="name">view_email_server_form_bounce_address</field>
        <field name="model">fetchmail.server</field>
        <field name="inherit_id" ref="fetchmail.view_email_server_form"/>
        <field name="arch" type="xml">
            <notebook position="inside">
                <page string="Notify bounce emails to">
                    <field name="bounce_notify_partner_ids"/>
                </page>
            </notebook>
        </field>
    </record>
</odoo>