add script for testing app SMTP connections

config/environments/development.rb

@@ -27,7 +27,7 @@ Rails.application.configure do
   end
 
   # Don't care if the mailer can't send.
-  config.action_mailer.raise_delivery_errors = false
+  config.action_mailer.raise_delivery_errors = true
 
   config.action_mailer.perform_caching = false