diff --git a/lib/basic_signup_whitelist.ex b/lib/basic_signup_whitelist.ex
index ab5aa85..2f2763f 100644
--- a/lib/basic_signup_whitelist.ex
+++ b/lib/basic_signup_whitelist.ex
@@ -4,15 +4,15 @@ defmodule BasicSignupWhitelist do
   """
 
   @doc """
-  Hello world.
+  false
 
   ## Examples
 
-      iex> BasicSignupWhitelist.hello()
-      :world
+      iex> BasicSignupWhitelist.mail_whitelisted("joe@example.com")
+      false
 
   """
-  def hello do
-    :world
+  def mail_whitelisted(_email) do
+    false
   end
 end
diff --git a/test/basic_signup_whitelist_test.exs b/test/basic_signup_whitelist_test.exs
index 3654492..36d6904 100644
--- a/test/basic_signup_whitelist_test.exs
+++ b/test/basic_signup_whitelist_test.exs
@@ -2,7 +2,7 @@ defmodule BasicSignupWhitelistTest do
   use ExUnit.Case
   doctest BasicSignupWhitelist
 
-  test "greets the world" do
-    assert BasicSignupWhitelist.hello() == :world
+  test "When not set, not whitelisted" do
+    assert BasicSignupWhitelist.mail_whitelisted("joe@example.com") == false
   end
 end