Ship particular customers an electronic mail when posts are revealed

I’ve received the next code, which is meant to run when a brand new submit is revealed for the primary time, verify if a customized subject ‘specific_users’ has information (this makes use of Superior Customized Fields), and if that’s the case, ship an electronic mail to every of the chosen customers.

/**
 * Ship customers a notification of latest grower posts 
 */
operate notify_growers($submit) {
// Solely notify for grower posts
if ( $post->post_type != 'grower_posts' ) return;

$post_id = $post->ID;

// ...run code as soon as
if ( !get_post_meta( $post_id, 'emailsent', $single = true ) ) {

    $specific_users = get_field('specific_users',$post_id);
    if(isset($specific_users) && is_array($specific_users)) {
        foreach($specific_users as $specific_user) {

            $to = $specific_user['user_email'];
            $topic = 'Grower Information: ' . get_the_title($post_id);

            $message = '';
            $message .= '<p>' . get_the_excerpt($post_id) . '…</p>';
            $message .= '<p><a href="' . get_permalink($post_id) . '"><sturdy>Proceed Studying &raquo;</sturdy></a></p>';

            wp_mail($to, $topic, $message );

        }
        unset($specific_user);
        //print("<pre>Consumer IDs = ".print_r($user_ids,true)."</pre>");
    } else { return; }

    // Make sure that this does not run once more
    update_post_meta( $post_id, 'emailsent', true );
}

}
add_action( 'draft_to_publish', 'notify_growers' );
add_action( 'new_to_publish', 'notify_growers' );

It isn’t sending any emails, and I am unsure the best way to go about debugging it.

Aspect query, is sending the e-mail within the foreach loop the easiest way to do it? Or ought to I do it with BCCs by some means?

Thanks,
Angus