Using contact form 7 action url filter

contact-form-7-url-filter.php

<?php


add_filter('wpcf7_form_action_url', 'wpcf7_custom_form_action_url');
function wpcf7_custom_form_action_url($url) {
    global $post;
    
	// Change the value of $id_to_change to the post id where the form is
    $id_to_change = 1;
    
    if($post->ID === $id_to_change) {
	    // The URL you want to post to
        return 'wheretopost.asp';
	} else {
        return $url;
	}
}