Safer network

The idea if a company to have a network that is completely disconnected from any outside network. Wait, read the rest before you start bad mouthing the idea. So, there would be a mail server in the internal network that would distribute and receive mails internally. Meanwhile there is an external server that receives all mails from the exterior. These two servers are usually disconnected from each other. At every minute or whatever period found appropriate, the external server would be physically disconnected from the external network and then it would be phisically connected to the internal server. Both server would swap mails during whatever time was necessary. During this time none of the computers would be connected to the external network. After swapping all mails, the servers would be physically disconnected again and the external server would be reconnected to the internet. This way it would be impossible for a hacker to perform a direct and live attack to the company's network. The biggest danger would be trojan virus and such.

To connect and disconnect the servers, an electronic switch could be designed that would work under a timer to decide when to connect and disconnect each of the servers. The electronics of the switch wouldn't be in contact with the network itself, so that it couldn't be tampered with via internet.

Off course this does not invalidate "Mission Impossible"-like attacks, but nothing really does, right?