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Reverse DNS

Discussion in 'Web & Email' started by nirvaeh, May 18, 2005.

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  1. nirvaeh

    nirvaeh Thread Starter

    May 18, 2005
    I am working for a company that has an Email server for a few other companies. One of these companies can't email to verizon, aol, and other specific addresses. I think it has something to do with reverse DNS. I checked the postmaster error message and it said the Reverse DNS lookup for your IP address is failing.
    Any help on how to set up Reverse DNS?

  2. Rollin' Rog

    Rollin' Rog

    Dec 9, 2000
    I'm not really sure what you are seeing. Every IP address (that's the numeric address) has a "common" domain name associated with it.

    If you know the IP you should be able to "ping" it and see the domain name associated with it. Similarly if you ping the domain name, you should get the IP.

    For example if you open a command prompt and enter:

    ping www.techguy.org

    you should see:

    come up as the IP. You could paste that into an address line and get here.

    If you run tracert

    You should arrive at the destination domain

    If you/they are not getting a Domain Name, the fault normally lies in the DNS servers which host the association. In that case, try the IP if you know it.

    There is also a useful site here you can use for lookups:


    Could it be they are being blocked for sending spam?
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