530-5.5.1 Authentication Required. Learn more at on rails app

am new to mails in rails.I am referring http://guides.rubyonrails.org/action_mailer_basics.html to learn. I am getting error like:

config.action_mailer.default_url_options = { :host => 'localhost:3000' }
ActionMailer::Base.smtp_settings = {

                :address        => "smtp.gmail.com",
                :port           => 587,
                :authentication => :plain,
                :user_name      => "<my gmail>@gmail.com",
                :password       => "<my gmail password>",
                :openssl_verify_mode  => 'none' }

I am try all answer but not resolved this problem.