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diff --git a/actionmailer/lib/action_mailer/delivery_method.rb b/actionmailer/lib/action_mailer/delivery_method.rb
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+++ b/actionmailer/lib/action_mailer/delivery_method.rb
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+require "active_support/core_ext/class"
+module ActionMailer
+  module DeliveryMethod
+
+    autoload :File,     'action_mailer/delivery_method/file'
+    autoload :Sendmail, 'action_mailer/delivery_method/sendmail'
+    autoload :Smtp,     'action_mailer/delivery_method/smtp'
+    autoload :Test,     'action_mailer/delivery_method/test'
+
+    # Creates a new DeliveryMethod object according to the given options.
+    #
+    # If no arguments are passed to this method, then a new
+    # ActionMailer::DeliveryMethod::Stmp object will be returned.
+    #
+    # If you pass a Symbol as the first argument, then a corresponding
+    # delivery method class under the ActionMailer::DeliveryMethod namespace
+    # will be created.
+    # For example:
+    #
+    #   ActionMailer::DeliveryMethod.lookup_method(:sendmail)
+    #   # => returns a new ActionMailer::DeliveryMethod::Sendmail object
+    #
+    # If the first argument is not a Symbol, then it will simply be returned:
+    #
+    #   ActionMailer::DeliveryMethod.lookup_method(MyOwnDeliveryMethod.new)
+    #   # => returns MyOwnDeliveryMethod.new
+    def self.lookup_method(delivery_method)
+      case delivery_method
+      when Symbol
+        method_name  = delivery_method.to_s.camelize
+        method_class = ActionMailer::DeliveryMethod.const_get(method_name)
+        method_class.new
+      when nil # default
+        Smtp.new
+      else
+        delivery_method
+      end
+    end
+
+    # An abstract delivery method class. There are multiple delivery method classes.
+    # See the classes under the ActionMailer::DeliveryMethod, e.g.
+    # ActionMailer::DeliveryMethod::Smtp.
+    # Smtp is the default delivery method for production
+    # while Test is used in testing.
+    #
+    # each delivery method exposes just one method
+    #
+    #   delivery_method = ActionMailer::DeliveryMethod::Smtp.new
+    #   delivery_method.perform_delivery(mail) # send the mail via smtp
+    #
+    class Method
+      superclass_delegating_accessor :settings
+      self.settings = {}
+    end
+    
+  end
+end