Date: Fri, 28 Jan 2011 13:07:33 +0200
From: jack <jcfmasters@yahoo.com>
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Subject: Re: mail server in local network
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rogk wrote:
> Hello.
> 
> I have trouble in one question.
> I have network Lan+NAT+ some Linux servers + windows workstations.
> Main server - linux with nat/dhcpd/bind - its for ex. sub.domain.com
> and i have server on other wan connection but with second interface in
> my lan - its mail server (ex. domain.com)
> Connections from Lan do mail server is made by main server --> WAN -- >
> WAN interface od mail server.
> How to tell for all workastions that here is shorter way to connect to
> mail server - directly by LAN not wan?
> 

You could set up bind in a split-horizon configuration, and tell the 
workstations that mail.sub.domain (or whatever they are configured to 
use as mail server) is the internal interface of the mail server, while 
telling clients in the rest of the world that it is the external interface.

j