mail not whitelisted when not set

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