Record count in an unrelated model

I want to do a record count from within a controller, but the problem
is that the models are not related.
The code:
$this->set(
'inbox_count',
$this->Email->find(
'count',
array(
'conditions' => array('to_user_id' => $this->Session-
>read('Auth.User.id'))
)
)
);
... gives an error:

Notice (8): Undefined property: CategoriesController::$Email [APP
\controllers\categories_controller.php, line 11]

Is there a way around this?

Thanks.

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