public function sendPrivateMessage($recipient, $subject, $text, $inReplyTo = false) {
    Loader::model('user_private_message');
    $subject = ($subject == '') ? t('(No Subject)') : $subject;
    $db = Loader::db();
    $dt = Loader::helper('date');
    $v = array($this->getUserID(), $dt->getLocalDateTime(), $subject, $text, $recipient->getUserID());
    $db->Execute('insert into UserPrivateMessages (uAuthorID, msgDateCreated, msgSubject, msgBody, uToID) values (?, ?, ?, ?, ?)', $v);
 
    $msgID = $db->Insert_ID();
 
    if ($msgID > 0) {
        // we add the private message to the sent box of the sender, and the inbox of the recipient
        $v = array($db->Insert_ID(), $this->getUserID(), $this->getUserID(), UserPrivateMessageMailbox::MBTYPE_SENT, 0, 1);
        $db->Execute('insert into UserPrivateMessagesTo (msgID, uID, uAuthorID, msgMailboxID, msgIsNew, msgIsUnread) values (?, ?, ?, ?, ?, ?)', $v);
        $v = array($db->Insert_ID(), $recipient->getUserID(), $this->getUserID(), UserPrivateMessageMailbox::MBTYPE_INBOX, 1, 1);
        $db->Execute('insert into UserPrivateMessagesTo (msgID, uID, uAuthorID, msgMailboxID, msgIsNew, msgIsUnread) values (?, ?, ?, ?, ?, ?)', $v);
    }
 
    // If the message is in reply to another message, we make a note of that here
    if (is_object($inReplyTo)) {
        $db->Execute('update UserPrivateMessagesTo set msgIsReplied = 1 where uID = ? and msgID = ?', array($this->getUserID(), $inReplyTo->getMessageID()));
    }
 
    // send the email notification
    if ($recipient->getAttribute('profile_private_messages_notification_enabled')) {
        $mh = Loader::helper('mail');
        $mh->addParameter('msgSubject', $subject);
        $mh->addParameter('msgBody', $text);
        $mh->addParameter('msgAuthor', $this->getUserName());
        $mh->addParameter('msgDateCreated', $msgDateCreated);
        $mh->addParameter('profileURL', BASE_URL . View::url('/profile', 'view', $this->getUserID()));
        $mh->addParameter('profilePreferencesURL', BASE_URL . View::url('/profile/edit'));
        $mh->to($recipient->getUserEmail());
 
        Loader::library('mail/importer');
        $mi = MailImporter::getByHandle("private_message");
        if (is_object($mi) && $mi->isMailImporterEnabled()) {
            $mh->load('private_message_response_enabled');
            // we store information ABOUT the message here. The mail handler has to know how to handle this.
            $data = new stdClass;
            $data->msgID = $msgID;
            $data->toUID = $recipient->getUserID();
            $data->fromUID = $this->getUserID();
            $mh->enableMailResponseProcessing($mi, $data);
        } else {
            $mh->load('private_message');
        }
 
 
        if(UserPrivateMessageLimit::isOverLimit($this->getUserID())) {
            return false;
        } else {
            $mh->sendMail();
            return true;
        }            
    }
    else
    {
        return true;
    }
}