WordPress at a glance
action is not described

make_ham_user action-hook . WP 3.0.0

Fires after the user is marked as a HAM user. Opposite of SPAM.

Usage

add_action( 'make_ham_user', 'action_function_name_2384' );
function action_function_name_2384( $id ){
	// action...
}
$id(int)
ID of the user marked as HAM.

Where the hook is called

update_user_status()
wp-admin/includes/ms.php 410
do_action( 'make_ham_user', $id );

Where the hook is used (in WP core)

Does not used.