newsupernova/vendor/magento/module-send-friend/etc/config.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">
    <default>
        <sendfriend>
            <email>
                <enabled>1</enabled>
                <template>sendfriend_email_template</template>
                <allow_guest>0</allow_guest>
                <max_recipients>5</max_recipients>
                <max_per_hour>5</max_per_hour>
                <check_by>0</check_by>
            </email>
        </sendfriend>
        <captcha translate="label">
            <frontend>
                <areas>
                    <product_sendtofriend_form>
                        <label>Send To Friend Form</label>
                    </product_sendtofriend_form>
                </areas>
            </frontend>
        </captcha>
        <customer>
            <captcha>
                <shown_to_logged_in_user>
                    <product_sendtofriend_form>1</product_sendtofriend_form>
                </shown_to_logged_in_user>
            </captcha>
        </customer>
    </default>
</config>