public static function optIn($email)
 {
     if (Shineisp_Commons_Utilities::isEmail($email)) {
         // Check if the email is already registered
         $retval = Doctrine::getTable('NewslettersSubscribers')->findOneBy('email', $email);
         if (empty($retval)) {
             // Save the new email address
             $subscriber = new NewslettersSubscribers();
             $subscriber->email = $email;
             $subscriber->subscriptiondate = date('Y-m-d H:i:s');
             if ($subscriber->trySave()) {
                 // Send the email to confirm the subscription
                 $retval = Shineisp_Commons_Utilities::getEmailTemplate('new_subscriber');
                 if ($retval) {
                     $subject = $retval['subject'];
                     $template = $retval['template'];
                     $isp = Isp::getActiveISP();
                     $template = str_replace("[signature]", $isp['company'], $template);
                     Shineisp_Commons_Utilities::SendEmail($isp['email'], $email, null, $subject, $template);
                 }
                 return true;
             }
         }
     }
     return false;
 }