mail-addons/email_headers/data/ir_config_parameter_data.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo noupdate="1">
    <record id="prioritize_replyto_over_headers" model="ir.config_parameter">
        <field name="key">email_headers.prioritize_replyto_over_headers</field>
        <field name="value">True</field>
    </record>
    <!-- The original field was called just strip_message_ids, but since
         it's manually set in some production databases, it's risky to
         define here. It might break a database upgrade. -->
    <record id="strip_mail_message_ids" model="ir.config_parameter">
        <field name="key">email_headers.strip_mail_message_ids</field>
        <field name="value">True</field>
    </record>
</odoo>