def send_change_notice act, followed_set, follow_option
  return unless changes_visible?(act)

  Auth.as(left.id) do
    Card[:follower_notification_email].deliver(
      act.card, { to: email },
      auth: left,
      active_notice: { follower: left.name,
                       followed_set: followed_set,
                       follow_option: follow_option }
    )
  end
end