Put your app plugin directory as TinyMail.
In 2.0 you need to enable the plugin your app/Config/bootstrap.php file:
<?php
CakePlugin::load('TinyMail', array('bootstrap' => false, 'routes' => true));
?>Enable admin routing in app/Config/core.php file:
<?php
Configure::write('Routing.prefixes', array('admin'));
?>The MIT License (MIT)