In this post, I’ve create a video demo of what I’ve told in the posts.
The scenario is made up of a mail server (hMailServer) which is located behind a TOR hidden service and do not access to Internet. By means of do not access to Internet, I mean that hMailServer’s access to the Internet is blocked by firewall which it cannot send emails to other servers. It is used to ensure local delivery of emails.
Additionally there are two users: alice and bob over the fake domain of hidden.one which communicate with each other over the hidden mail server.
You can find the video on my Youtube channel.