defimpl Poison.Encoder, for: Apostle.Queue do
  def encode queue, _opts do
    queue
      |> Map.get(:emails)
      |> Enum.reduce(%{recipients: %{}}, fn(mail,r)->
        email = Map.get mail, :email
        recipients = Map.get r, :recipients
        recipients = Map.put recipients, email, mail
        Map.put r, :recipients, recipients
      end)
      |> Poison.encode!
  end
end