Contact Form 7 - Conditionally Chance Recipient to Post Meta

filterContactFormRecipient.php

<?php
/**
 * Contact Form 7 - Conditionally Chance Recipient to Post Meta
 *
 * This function gets the current post id and grabs the desired meta to use
 * it on the submited form data to change the recipient email conditionally.
 * You can add some conditional checks to make sure the data is correct.
 * 
 * @author  António Pinto <[email protected]>
 * @link    https://gitlab.com/snippets/1662384
 *
 * @param \WPCF7_ContactForm $contactForm
 */
function filterContactFormRecipient($contactForm)
{
    // Get the post id from the existing WPCT7 special mail tags.
    $postID = \wpcf7_special_mail_tag('', '_post_id', '');
    
    // Get the desired post meta.
    $emailAddress = get_post_meta($postID, 'company_email', true);

    // Get the submited form email data.
    $mailData = $contactForm->prop('mail');

    // Change the 'recipient' (or any other field).
    $mailData['recipient'] = $emailAddress;
    
    // Update/set the form properties.
    $contactForm->set_properties(['mail' => $mailData]);
}

add_action('wpcf7_before_send_mail', __NAMESPACE__ . '\\filterContactFormRecipient');