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Internal / External DNS Entries & MX Record

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Last Modified: 2012-05-06
Hello Experts,

So heres a quick summary of whats happening.  I have inherited a huge DNS mess.  We have external entries hosted through GoDaddy.com and two internal DNS servers.  I also have just installed a second exchange server, and I am in the process of removing the first server.    Before I remove any servers, I want to ensure that the e-mail continues to route correctly.  I have followed all steps outlined in http://support.microsoft.com/kb/822931.

Currently in the GoDaddy control panel, I have an @ record that points to the public url of my webserver (216.253.206.206).  I have an MX record that lists mail.luceresearch.com with a priority of 10 that points to the host @.  If I check this on www.mxtoolbox.com it resolves correctly to the IP address 216.253.206.206.

The new mail server is located at the public IP address 216.253.206.212.  How would I configure this in GoDaddy's DNS control to point my MX record at my new server IP?

Next - Internal DNS....
Oy - its a bigger mess.  I have the forward lookup zone lucer.luceresearch.local, luceresearch.com, and luceresearch.org.  All names and private IP's are listed in the .local zone.  In the luceresearch.com forward lookup, there are A records that point to the private IP (i.e. www points to 192.168.0.6) for DNS resolution within the intranet.  In the luceresearch.org I have two A records: mail that points to private IP (192.168.0.6) and mail: that points to public IP (216.253.206.206).  The MX record is listed in this zone as mail, MX, and points to mail.luceresearch.org.

I want to make sure that I can point the MX record to the new exchange server before I remove the first one from the site.  I appreciate any advice.
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