# File lib/action_mailer/delivery_methods.rb, line 54
      def add_delivery_method(symbol, klass, default_options={})
        class_attribute("#{symbol}_settings""#{symbol}_settings") unless respond_to?("#{symbol}_settings""#{symbol}_settings")
        send("#{symbol}_settings=""#{symbol}_settings=", default_options)
        self.delivery_methods = delivery_methods.merge(symbol.to_sym => klass).freeze
      end