poMMo, a nice mailing list software :)

<?php
function save2Pommo(&$fields){

   global $modx;
   
   if($fields['list']=='Added to mailing list'){
   
      $query="SELECT * FROM pommo_subscribers WHERE email='".$fields['email']."'";

      $result=$modx->db->query($query);
      if($modx->recordCount($result)<1){
   				
         $subscriberInfo[email]=$fields['email'];
         $subscriberInfo[time_registered]=date('YmdHis');
         $subscriberInfo[status]=1;
      
         $dbQuery=$modx->db->insert($subscriberInfo,'pommo_subscribers');	
         $subId=$modx->db->getInsertId();
         
         $subscriberField1[field_id]=1;
         $subscriberField1[subscriber_id]=$subId;
         $subscriberField1[value]=$fields['Name'];
         $dbQuery=$modx->db->insert($subscriberField1,'pommo_subscriber_data');
      		
         $subscriberField2[field_id]=2;
         $subscriberField2[subscriber_id]=$subId;
         $subscriberField2[value]=$fields['lastName'];
         $dbQuery=$modx->db->insert($subscriberField2,'pommo_subscriber_data');
         
         $subscriberField3[field_id]=3;
         $subscriberField3[subscriber_id]=$subId;
         $subscriberField3[value]=$fields['zipCode'];
         $dbQuery=$modx->db->insert($subscriberField3,'pommo_subscriber_data');
         
   	}
   }
   
   return true;
}

return '';
?>

<?php
require('pommo/bootstrap.php');  // path to where Pommo installed
Pommo::requireOnce($pommo->_baseDir.'inc/helpers/subscribers.php');

function add_subscriber ($email, $firstName, $lastName) {
    // create subscriber object
  $subscriber = array(
   'email' => $email,
   'registered' => time(),
   'ip' => $_SERVER['REMOTE_ADDR'],
   'status' => 1, // 0: Inactive, 1: Active, 2: Pending
   'data' => array (1 => $firstName, 2 => $lastName) // fields depend on Pommo subscriber fields you have setup
  );
  
  if (PommoHelper::isDupe ($email)) {
    $id = PommoSubscriber::getIDByEmail ($email);
    $subscriber ['id'] = $id [0];
    return PommoSubscriber::update($subscriber);
  }
  else 
    return PommoSubscriber::add($subscriber);
}

function remove_subscriber ($email) {
  $id = PommoSubscriber::getIDByEmail ($email);
  return PommoSubscriber::delete($id);
}
?>