Re: Fake domain

Greetings jose,

Here is my personal opinion I have done similar project several time. You are making it too complicated in my opinion,
Here what I would do, schedule cutover on Friday, make sure all users popped into their external ISP and download all their e-mail to their outlook and they exported mail into "PST" file on same location each workstation.

You stood up AD and Exchange created all required accounts and mailboxes, prepared all workstations for the new domain.
Simply do the cut over, change MX record to point to new exchange server. Prepare document showing your users how to import existing PST into newly created mail account via outlook or you find a way to script it or do it manually (-:

Good luck
Oz


"Jose Huerta" <Jose.M.Huerta@xxxxxxxxx> wrote in message news:331ec4be-f716-4617-b4d4-77f62778be85@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi all,

I'm finishing the installation of an exchange server from scratch for
an organization that currently have email service provided by an ISP
via POP3.

The fact is that i'm not sure enought to move all the email accounts
and deny the service to 40 people. I want to make a "proof of concept"
first.

What i've done is:

1.- Create the domain contoso.com and copy all the "actual" DNS
registers to the server DNS. Then set all the DNS server of the
clients be my DNS server (not the "actual" one). The machine providing
active directory and DNS services is server.contoso.com.

2.- Add to "actual" DNS the IP of server.contoso.com.

3.- Install exchange at server.contoso.com. Config connectors. I set
that accept emails from contoso.com and server.contoso.com.

4.- I add my email account (jose@xxxxxxxxxxx). And I add the address
jose@xxxxxxxxxxxxxxxxxx in the emails list.

By this moment if sending an email to jose@xxxxxxxxxxxxxxxxxx the
message is received correctly.

5.- Go to my ISP control panel, delete the account jose@xxxxxxxxxxx
and create a redirection from jose@xxxxxxxxxxx to
jose@xxxxxxxxxxxxxxxxxxx

By this moment, if sending an email to jose@xxxxxxxxxxx the message is
receive correctly. Also the emails sent by me are received in external
accounts (of other domains).


Now the proble. If i want to send an email to carlos@xxxxxxxxxxx, wich
have an account at the ISP, I receive an response of user not found.
Tha means that the server trys to locate the user inside the domain
and not forwards the call to the ISP. I have configured the MX
register at both DNS to point to the ISP server.

I know that if moving all people it will work, but I'm not sure to
have an stable system, to be aware of spam or not secured enough. I
would like to test the systems a couple of weeks before migrating all
people.

System data:

Server is behind a NAT router. The server.contoso.com DNS entry at
"actual" DNS is the public IP of our network, and opened the ports at
the NAT.

SO: Windows Server 2008
Exchange 2007
I made a typical setup with mailboxes, hub and client access.

Regards,

Jose Huerta

.

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