User Expired Admin Notification goes to which admin?

There isn’t a way to do this through the admin interface, but there is a WordPress filter which would allow you to set a different admin email.

By default the admin email used in the one set in the WordPress Admin > General Settings.

If you are comfortable with a little PHP code, you can use the expire_users_admin_email filter to change this to a different email address:

function my_expire_users_admin_email( $email ) {

	return '[email protected]';

}
add_filter( 'expire_users_admin_email', 'my_expire_users_admin_email' );

You could put that code in a custom plugin or your theme’s functions.php file.

Sorry, just noticed this is in the development version – not yet release.
It will be in version 1.0 due to be released soon.