From: winstonmvp@gmail.com   
      
   On 3/4/2026 4:18 PM, War Preparations wrote:   
   > Can emails be sent within a network without using the internet?   
   >   
   > For example, governments might block the internet during a war to   
   > prevent hackers from spying. If you have your own mail server and only   
   > want to communicate with 255 people, would this be possible? Armies   
   > around the world would need a way to communicate with their commanders.   
   >   
   > Just a thought.   
   >   
   >   
   >   
   >   
      
   A mail server can operate on a local network (LAN) without internet by   
   using internal SMTP/IMAP/POP3 services.   
      
   Email clients (Outlook, Thunderbird) need(required) to be configured to   
   point to the local server's IP address for both incoming(POP/IMAP) and   
   outgoing(SMTP).   
      
   Email server software is necessary.   
     - open source(free) may be available   
     => when looking for opensource, ensure that the company and   
   development is current. i.e. open source(especially free) may be   
   available, but no longer developed, supported, or updated.   
      
      
   --   
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