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Adding note about saving iptables instead of adding to script
<li>Create an iptables rule to allow incoming connections to your '''SMTP''' server on your '''vm2'''.</li>
<li>Once you open the port in the firewall, retry the '''nc''' command. You should get a different error this time (e.g. ''connection refused''). This time the problem is that your service isn't listening on the outside interface, it's currently configured to listen only on the loopback (lo) interface.</li>
<li>Add Make sure the new iptables rule to your gets saved script so that it will be loaded automatically from startup.</li>
</ol>
