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Host external dns, on internal dns server

A while back we were having a problem where our remote centers could not resolve the name etrack.teletrack.com  If I connected to the dns server (windows 2003, Active Directory) it could not resolve the name either. I would then flush and register dns, stop/start netlogon and then stop/start dns. I could then resolve the name. They wanted me to try to host the teletrack.com domain internally, so I setup the teletrack.com zone in here, and added all the records I could find. The remote hosts can now do what they need to do, but if we try to email teletrack, or if they try to email us, it fails. We receive a "(000B09B6) Host unreachable" message. I've attempted to recreate their mx records, but I'm not all that experienced with this. I've added A records for www (67.32.116.71), mail (12.178.11.202), mail2 (67.32.116.75), mail3 (12.178.11.203) and mail4 (67.32.116.74), and also one for just teletrack.com (67.32.116.71). I've also added mx records for mail, mail2 mail3 and mail4. It is currently not working. Is this something that is possible, or should I just remove the zone, and have the remote locations deal with the first problem. I posted the IP's, as they are available on the net, but if they need to be removed, I will do so...
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Hypercat (Deb)
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It did solve the inital problem. Where the hosts couldn't resolve the etrack.teletrack.com address. It's now fixed. So I'm stuck with trying to fix this aspect of it. Their ip addresses are fairly static, so I shouldn't have a problem there. This is also something I've tried to get going in a lab, with the MX records, so i'd like to see how to get it to work...
where do you set the conditional forwarder, on a microsoft dns server?
On your internal DNS server, go to the properties of the server and select the Forwarders tab.  Under "for the following domains" enter teletrack.com and specify the IP address of their DNS server.
Yes - open the DNS mgmt. console.  Right-click on the server name and go to Properties; click the Forwarders tab.  In the top box, click New and put in the domain name, and then put in the IP address for their nameserver.
Looks like the timestamp on those answers came through at the same time....are either of you opposed to split points? I won't be able to test until sunday, but if it does work, I'll award the points then.
Split points are yours to award - this happens all the time, don't sweat it.
No worries, as hypercat says, simul-posts happen all the time around here.  (Though it's very considerate of you to ask.)