Company splits into two, old Windows domain still in use including active directory in both companies, mail won't route

At one time we were one big company that we will call OriginalCompany for simplicity. Later the OriginalCompany split into two companies as part of a sell off resulting in NewCompany and OiginalCompany.

When the split occurred both OriginalCompany and NewCompany kept the same Windows Domain names internally, along with the Active Directory even though the two parts are no longer physically connected in anyway.

Our external internet domain has changed from OriginalCompany.com to NewCompany.com and email is working in all cases but one. When we try to send mail to someone at OriginalCompany.com it never seems to route past the exchange 2003 server. I believe that there is likely a configuration that needs to be changed.

Any ideas?
jnoble123Asked:
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SembeeCommented:
Do you have a second domain listed in the default recipient policy?
If not, set one.
This can be your live domain name, or a second dummy domain name (exchange.domain.com - where domain.com is your live domain name).
Then set that domain as the default.

Next, edit the properties of the original domain (still in the default recipient policy), and deslect the option: "This Exchange Organisation is responsible for all mail delivery to this address."

Finally, create an SMTP Connector for the original domain. Configure it to use a smart host and set the smart host to be the internet address of the other site's email server. If you are putting in an IP address, then remember to enclose it in [ ] - [192.192.192.192]. Ideally you should use a host name.

Email for those contacts should go out as well. If they don't, then ask the other company if they will setup a dummy domain on their server - exchange.orginaldomain.com or something like that and apply it to their users. Then reconfigure the mail enabled contact to have an address at that domain as well. (see my web site here for more details on to configure the contact in this way http://www.amset.info/exchange/contacts.asp). Add the dummy domain to the SMTP Connector that you created above - so that it has two domains listed - originaldomain.com and exchange.originaldomain.com. Exchange will treat both domains as external and send the email out via the connector.

Simon.
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SembeeCommented:
Does the originalcompany.com domain name appear in recipient policy?
Are you still using that domain for external email?

Simon.
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jnoble123Author Commented:
Not using that email for external email now using NewCompany.com instead of OriginalCompany.com.

Not sure about recipient policy. I will check.

~Jamie N
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jnoble123Author Commented:
We have two recipient policies.

The highest priority one has the correct SMTP info. The lowest priority one (also the default) has the incorrect internet SMTP domain info. Unfortunately I can't seem to delete or modify the default policy. Any suggestions?

~Jamie N
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SembeeCommented:
You cannot delete the default recipient policy.
I wouldn't suggest removing the domain from it either - if that domain has been used for the active directory that will upset things.

Do any users in the other company appear in your GAL for any reason whatsoever?

Simon.
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jnoble123Author Commented:
I didn't think deleting it would be possible but I was hopeful if it wasn't disruptive.

Yes, unfortunately we do have a few particular contacts in the old company that we do need to communicate with. This is ultimately what's driving the issue.

I wonder if I could do something like an alias at the unix email gateway to retranslate a fake address into the proper address after the message has left exchange?

ie.

email ==> jamie@tempoldcompany.com
alias conversion == jamie@tempoldcompany.com ==> jamie@originalcompany.com

That would get the email out anyway. Thoughts?

~Jamie N
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