diff --git a/lib/fun_core/basic_signup_whitelist.ex b/lib/fun_core/basic_signup_whitelist.ex
new file mode 100644
index 0000000..9f0d603
--- /dev/null
+++ b/lib/fun_core/basic_signup_whitelist.ex
@@ -0,0 +1,19 @@
+defmodule FunCore.BasicSignupWhitelist do
+  def normalize(email) do
+    email |> String.trim() |> String.downcase()
+  end
+
+  def addresses_as_list(addresses_str) do
+    addresses_str
+    |> String.split(",")
+    |> Enum.map(&normalize/1)
+  end
+
+  def mail_whitelisted_fun(signups_allowed, email_received) do
+    case signups_allowed do
+      nil -> false
+      "*" -> true
+      list_str -> normalize(email_received) in addresses_as_list(list_str)
+    end
+  end
+end
diff --git a/test/fun_core/basic_signup_whitelist_test.exs b/test/fun_core/basic_signup_whitelist_test.exs
index b63e0f1..ddb2f37 100644
--- a/test/fun_core/basic_signup_whitelist_test.exs
+++ b/test/fun_core/basic_signup_whitelist_test.exs
@@ -1,23 +1,6 @@
 defmodule FunCore.BasicSignupWhitelistTest do
   use ExUnit.Case
-
-  defp normalize(email) do
-    email |> String.trim() |> String.downcase()
-  end
-
-  defp addresses_as_list(addresses_str) do
-    addresses_str
-    |> String.split(",")
-    |> Enum.map(&normalize/1)
-  end
-
-  def mail_whitelisted_fun(signups_allowed, email_received) do
-    case signups_allowed do
-      nil -> false
-      "*" -> true
-      list_str -> normalize(email_received) in addresses_as_list(list_str)
-    end
-  end
+  import FunCore.BasicSignupWhitelist
 
   test "addresses_as_list" do
     assert addresses_as_list("joe@example.com, jane@example.com") == [