add_action('future_to_pending', 'send_emails_on_new_event');
add_action('new_to_pending', 'send_emails_on_new_event');
add_action('draft_to_pending', 'send_emails_on_new_event');
add_action('auto-draft_to_pending', 'send_emails_on_new_event');
/**
* Send emails on event publication
*
* @param WP_Post $post
*/
function send_emails_on_new_event($post) {
$emails = "[email protected], [email protected]"; //If you want to send to site administrator, use $emails = get_option('admin_email');
$title = wp_strip_all_tags(get_the_title($post->ID));
$url = get_permalink($post->ID);
$message = "Link to post: \n{$url}";
wp_mail($emails, "New post published: {$title}", $message);
}