Rails::Initializer.run do |config|
  # other stuff ...

  config.after_initialize do
    if config.frameworks.include?(:action_mailer) and RAILS_ENV != 'test'
      smtp_config_file = File.join(RAILS_ROOT, "config", "mailer.yml")
      if File.exist? smtp_config_file
        settings = YAML::load(ERB.new(File.read(smtp_config_file)).result)
        config.action_mailer.smtp_settings = (settings[RAILS_ENV] || {}).symbolize_keys
      end
    end 
  end
end