Add a Vagrantfile and the list of golden domains.

Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
+VAGRANTFILE_API_VERSION = "2"
+
+Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
+  # All Vagrant configuration is done here. The most common configuration
+  # options are documented and commented below. For a complete reference,
+  # please see the online documentation at vagrantup.com.
+
+  # Every Vagrant virtual environment requires a box to build off of.
+  config.vm.box = "hashicorp/precise32"
+
+  config.vm.define "sender" do |sender|
+    sender.vm.network "private_network", ip: "192.168.33.5"
+  end
+  config.vm.define "valid" do |valid|
+    valid.vm.network "private_network", ip: "192.168.33.7"
+  end
+  config.vm.provision :shell, path: "vagrant-bootstrap.sh"
+
+  config.vm.provider "virtualbox" do |vb|
+ #   vb.gui = true
+     vb.customize ["modifyvm", :id, "--memory", "256"]
+  end
+end

golden-domains.txt

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+ymail.com
+yandex.ru
+yahoo.co.uk
+wp.pl
+web.de
+vtext.com
+ukr.net
+t-online.de
+sompo-japan.co.jp
+sbcglobal.net
+salesforce.com
+rogers.com
+rocketmail.com
+rambler.ru
+marktplaats.nl
+interia.pl
+gmx.net
+gmx.de
+facebook.com
+craigslist.org
+bigpond.com
+aol.com

vagrant-bootstrap.sh

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+#!/usr/bin/env bash
+
+export DEBIAN_FRONTEND=noninteractive
+
+apt-get update -q
+apt-get install -q -y -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" postfix
+cat > /etc/hosts <<<EOF
+192.168.33.5 sender sender.example.com
+192.168.33.7 valid valid-example-recipient.com
+EOF