introduce better email validation regex

lib/bamboo/adapters/rfc2822_with_bcc.ex

@@ -16,7 +16,8 @@ defmodule Bamboo.SesAdapter.RFC2822WithBcc do
   @address_types ["From", "To", "Reply-To", "Cc", "Bcc"]
 
   # https://tools.ietf.org/html/rfc2822#section-3.4.1
-  @email_validation_regex ~r/\w+@\w+\.\w+/
+  # taken from https://github.com/DockYard/elixir-mail/blob/bc27eba27ea0895a2fc12f5ac00de3e944a7fd8f/lib/mail/renderers/rfc_2822.ex#L25
+  @email_validation_regex ~r/[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,64}/
 
   @doc """
   Renders a message according to the RFC2882 spec

test/lib/bamboo/adapters/ses_adapter_test.exs

@@ -6,9 +6,9 @@ defmodule Bamboo.SesAdapterTest do
   alias Mail.Parsers.RFC2822
   require IEx
 
-  defp new_email do
+  defp new_email(to \\ "[email protected]") do
     Email.new_email(
-      to: "[email protected]",
+      to: to,
       from: "[email protected]",
       cc: "[email protected]",
       bcc: "[email protected]",
@@ -54,6 +54,20 @@ defmodule Bamboo.SesAdapterTest do
     new_email() |> SesAdapter.deliver(%{})
   end
 
+  test "delivers mails with dashes in top level domain successfully" do
+    expected_request_fn = fn _, _, body, _, _ ->
+      message = parse_body(body)
+      assert Mail.get_to(message) == ["[email protected]"]
+
+      {:ok, %{status_code: 200}}
+    end
+
+    HttpMock
+    |> expect(:request, expected_request_fn)
+
+    new_email("[email protected]") |> SesAdapter.deliver(%{})
+  end
+
   test "delivers attachments" do
     expected_request_fn = fn _, _, body, _, _ ->
       message = parse_body(body)