<?php

$notifier = new Notifier\Notifier();
$notifier->pushProcessor(function($message) {
    $recipients = $message->getRecipients();
    // only set the filters just before sending.
    foreach ($recipients as &$recipient) {
        if ($recipient->getData() == 'Dries') {
            $recipient->addType('test', 'var_dump');
        }
    }
    return $message;
});
$notifier->pushHandler(new Notifier\Handler\VarDumpHandler(array('test', 'mailing')));

$message = new Notifier\Message\Message('test');
$message->addRecipient(new Notifier\Recipient\Recipient('Dries'));

$notifier->sendMessage($message);