Vagrant port forwarding setup and virtualbox configuration for NAT.

Vagrantfile

@@ -12,6 +12,48 @@ Vagrant.configure("2") do |config|
   config.vm.hostname = "mailinabox"
   config.vm.network "private_network", ip: "192.168.50.4"
 
+  # Forward required ports from host machine, in order to dispose
+  # the mailserver to the public network.
+
+  # DNS Server
+  config.vm.network "forwarded_port", guest: 53, host: 53, protocol: "udp"
+  config.vm.network "forwarded_port", guest: 53, host: 53, protocol: "tcp"
+
+  # SMTP
+  config.vm.network "forwarded_port", guest: 25, host: 25
+
+  # IMAP SSL
+  config.vm.network "forwarded_port", guest: 587, host: 587, protocol: "tcp"
+
+  # IMAP4 SSL
+  config.vm.network "forwarded_port", guest: 993, host: 993, protocol: "tcp"
+
+  # POP3 SSL
+  config.vm.network "forwarded_port", guest: 995, host: 995, protocol: "tcp"
+
+  # Sieve
+  config.vm.network "forwarded_port", guest: 4190, host: 4190
+
+  # HTTPS/HTTP
+  # Hint: You can expose this to a different port if your host machine already
+  # has a webserver configured on default ports (e.g.: 11080 | 11443)
+  # @todo: Fix menu items if a custom port is selected to add the new ports
+  # to the routes.
+  config.vm.network "forwarded_port", guest: 80, host: 80, protocol: "tcp"
+  config.vm.network "forwarded_port", guest: 443, host: 443, protocol: "tcp"
+
+  # Pyzor
+  config.vm.network "forwarded_port", guest: 24441, host: 24441, protocol: "udp"
+
+  # Postfix
+  config.vm.network "forwarded_port", guest: 20025, host: 20025, protocol: "udp"
+  config.vm.network "forwarded_port", guest: 20025, host: 20025, protocol: "tcp"
+
+  # Enable NatAliasMode to forward real ip addresses in log files
+  config.vm.provider "virtualbox" do |v|
+    v.customize ["modifyvm", :id, "--nataliasmode1", "proxyonly"]
+  end
+
   config.vm.provision :shell, :inline => <<-SH
 	# Set environment variables so that the setup script does
 	# not ask any questions during provisioning. We'll let the