Config exchange server for Intranet and Internet access

I know there is a simple solution but having trouble finding it - mainly because I probably don't know terminology. Here is the simple issue.

We have Exchange server that works fine with MANY email domains running on it. We setup all the MX records to be mail.domain.com and their POP server works via Internet outside our network. However if we connect to our internal network with same laptop - the mail.domain.com will not work, but the private IP of the email server will. So we are having a DNS issue somewhere. Editing the HOST file on the PC works for PCs that stay inside office but it is a pain for laptops having to change incoming server from mail to ip and vice versa.

So I guess I need step by step for an Exchange 2003 for "shadow" DNS entry at the server layer?
interc3905Asked:
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AmitIT ArchitectCommented:
How many NIC's you have on this server?
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interc3905Author Commented:
One
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AmitIT ArchitectCommented:
Can you run nslookup and check the result.
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interc3905Author Commented:
nslookup resolves to Internet address inside and out
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AmitIT ArchitectCommented:
That's not correct. It should resolve to server name.
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interc3905Author Commented:
nslookup is not the issue; it produces the right ip address for our server via MX record for that domain. It does it outside our network and inside our network.
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AmitIT ArchitectCommented:
No that is not right. Internally, it is should point to server name not to external dns record, that's why internal users are unable to connect to Exchange server.
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interc3905Author Commented:
Internet users are able to connect to Exchange server by internal ip address only. nslookup resolves the MX record domain name to the external static ip. Using the mail.domain.com or external ip inside the NETWORK does not work. I want that to work so no matter where the laptop is - in or out - it works with mail.domain.com.
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AmitIT ArchitectCommented:
It is time for you to upgrade to Exchange 2010. Which has autodiscovery feature and you can configure same fqdn for internal and external users.
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interc3905Author Commented:
So how do you do that with Exchange 2010? I have that issue at another location also and they do have Exchange 2010.
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interc3905Author Commented:
I resolved the issue; you have to make sure each PC's primary DNS on LAN is pointing to internal ip of gateway instead of the ISP DNS #s. Then on the server go in to the DNS Manager and add an A record for mail.domain.com and point it to the LAN IP of the server itself. Walla. Email now resolves domain name inside and outside network. Knew there had to be a simple answer other than just upgrade to 2010 Exchange.
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interc3905Author Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for interc3905's comment #a40777925

for the following reason:

No one answered my question accurately - only offered Plan B.
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AmitIT ArchitectCommented:
Good you found the solution, as that was not Exchange issue, it is a NIC misconfiguration issue. Without seeing the server, it is bit difficult to advise remotely. Also note, in my first post I pointed to NIC only.
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interc3905Author Commented:
Still would have to add A records to DNS Server so you were partly right.
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AmitIT ArchitectCommented:
Thanks for the point :)
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