<?php

if (class_exists('wpMail')) {
    if ($wpMail = new wpMail()) {
        global $wpdb, $Subscriber, $Db;
        $Db -> model = $Subscriber -> model;

        if ($subscribers = $Db -> find_all(array('specialhead' => "yes"))) {
            //retrieves all subscribers with "specialhead" field equal to "yes"
        }
    }
}

?>