hostz-frank

<?php

/**
 * Send copy to Divi's contact form sender.
 */
add_filter( 'et_contact_page_headers', 'change_et_contact_page_headers', 10, 3 );
function change_et_contact_page_headers( $headers, $contact_name, $contact_email ) {
	$headers[] = 'Cc: ' . $contact_email;
	return implode( "\n", $headers );
}

hostz-frank

<?php
/**
 * Copy lines below into functions.php of your Divi child theme.
 */

add_filter( 'et_contact_page_headers', 'mycopytosender', 10, 4 );
function mycopytosender( $headers, $contact_name, $contact_email ) {
	$headers[] = "Cc: \"{$contact_name}\" <{$contact_email}>";
	return $headers;
}