mail on local network

Bill Moran wmoran at
Thu Jun 12 19:35:00 PDT 2003

Man Alive wrote:
> Hello all,
> I am setting up a local mail network with no outside connection, just
> users on local network emailing each other - can postfix be set up to
> do this? I have no registered domain name, so how do I define
> domain/host/origin? I have had trouble finding website that explains
> how to set up an unconnected mail network with no registered domain
> names. If you could explain how to set up these names (a sample
> configuration) or point me to the website that helps me to set it up,
> I would appreciate it very much.

The short answer is: set up a local DNS server with the apropriate MX
entries to tell everyone's machine where to go for mail.  Since you'll
be configuring all the clients to talk to the mail server that has all
the DNS info, nothing ever gets confused.

Yes, you can do it.  It's pretty easy (unless you're unfamiliar with

Technically you _shouldn't_ just make up your own domain name, but if
these machines will never touch the Internet, who's going to know or
care.  Just pick an apropriate name and use it.  The only place you'll
hit trouble is when you want to integrate the system into the Internet
in a few years.

Bill Moran
Potential Technologies

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