问如何定义回复地址？

EN

class Notifications < ActionMailer::Base
  default :from     => 'your_app@your_domain.com',
          :reply_to => 'some_other_address@your_domain.com'
end

class Contacts < ActionMailer::Base
  def new_contact
    mail( :to       => 'somebody@some_domain.com',
          :from     => 'your_app@your_domain.com',
          :reply_to => 'someone_else@some_other_domain.com')
  end
end

config/environments/development.rb

Rails.application.configure do
  config.action_mailer.default_options = {
      reply_to:             'test@example.com'
  }
end