I assume you can find the posts. From there, extract the categories and 
find the users like so

$posts = // find today's posts
$followers = $this->Follower->find('all', array(
'conditions' => array(
'Follower.category_id' => Set::extract('/Post/category_id', $posts)
),
'contain' => array('User')
));

// user emails
$emails = Set::extract('/User/email', $followers);

Seems straightforward enough.

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