Thank you for sharing the link. I have gone through the document, and it sounds interesting.
So the function of Proxmox Mail gateway is to provide a powerful and affordable server solution to eliminate spam, virus-infected, and undesirable mail contents. I have also learned from news feeds that, using machine learning we can eliminate spam/suspicious emails. Just like your tool, the process involved in the installation is not that complex either.
Email providers used to fight spam using rule-based programming. It remained problematic for a while since it did not properly catch all spam emails coming into inboxes. Today, Machine learning can detect spam more accurately using neural networks to get rid of junk and phishing emails. It does so by constantly identifying new threats and trends across the network. Methods with the help of machine learning and IoT will ease the burden of removing the spam emails from the inbox.
Seems like your tool imparts a similar method to machine learning. This is the first time I hear a tool of this measurement. Once again thank you for sharing the link.