       0
   """
   def pop() do
-    GenServer.call(__MODULE__, :pop)
+    GenServer.call({:global, __MODULE__}, :pop)
   end
 
   @doc ~S"""

      [%Swoosh.Email{from: {"", "tony.stark@example.com"}, headers: %{"Message-ID": "a1b2c3"}, [...]}]
  """
  def all() do
    GenServer.call(__MODULE__, :all)
  end

  @doc ~S"""

      %Swoosh.Email{from: {"", "tony.stark@example.com"}, headers: %{"Message-ID": "a1b2c3"}, [...]}
  """
  def get(id) do
    GenServer.call({:global, __MODULE__}, {:get, id})
  end

  @doc ~S"""
