perform_delivery_smtp

# File actionmailer/lib/action_mailer/base.rb, line 561
      def perform_delivery_smtp(mail)
        destinations = mail.destinations
        mail.ready_to_send

        Net::SMTP.start(smtp_settings[:address], smtp_settings[:port], smtp_settings[:domain], 
            smtp_settings[:user_name], smtp_settings[:password], smtp_settings[:authentication]) do |smtp|
          smtp.sendmail(mail.encoded, mail.from, destinations)
        end
      end