Subscribe after it makes green the test. Some refactoring?

pages_controller.rb

  def subscribe
    subscriber = Subscriber.where(email: params[:newsletter_email]).first
    if subscriber
      if subscriber.approval != "Approved"
        NewsletterMailer.send_code_confirm(subscriber.email, subscriber.code_confirmation).deliver
        redirect_to root_url, notice: "Σας εστάλη ένα email επιβεβαίωσης."
      else
        redirect_to root_url, notice: "Το email σας υπάρχει ήδη στη λίστα μας. Σας ευχαριστούμε για την εγγραφή!"
      end
    else
      new_subscriber = Subscriber.new(email: params[:newsletter_email], approval: "Pending")
      if new_subscriber.save
        NewsletterMailer.send_code_confirm(new_subscriber.email, new_subscriber.code_confirmation).deliver
        redirect_to root_url, notice: "Σας εστάλη ένα email επιβεβαίωσης."
      else
        redirect_to root_url, alert: "Μη έγκυρo email."
      end
    end
  end