From: LuKreme (kremelskreme.com)
Date: Fri Apr 17 2009 - 04:10:49 CDT

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I have a LAN with several computers on it used by a variety of users.
I have one server on the LAN running OS X and have postfix installed
(probably needs updating, but not gotten that far). What I want to do
is to have users on the LAN send emails to other users on the LAN (userexample.local
) and have those email addresses mapped to specific addresses on the
remote server (fredexample.com, served by mail.example.com).

I do not want the users to be able to send mail via example.local to
any other users but those that I have mapped, and I do not want to
accept any mail from outside the LAN for userexample.local, but might
want accept mail for local users if they are sent to the outward
facing rdns for the machine (say usersubdomain.example.com).

So, i have a user bob who sends email to fredexample.local and my
LAN's DNS points example.local's MX record to 10.11.12.13, and then
postfix gets that mail, remaps it to fsmithexample.com and sends it
out via a connection to mail.example.com. if bob tries to send to maryexample.local
  and there is no map, the user is rejected. If bob tries to send to maryyahoo.com
  via the LAN postfix, it is rejected. 10.11.12.13's postfix will ONLY
send to mail.example.com and only for users in the map.

The question is, what is the best way to ensure that this works. What
is the best map to use, and am I forgetting anything obvious?

--
I find your lack of faith disturbing.

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