NXDOMAIN / public resolvers and zen.spamhaus.org

Discussion in 'Mail Server Support' started by dns operations, Mar 27, 2011.

  1. dns operations

    dns operations New Email

    Mar 27, 2011
    Likes Received:
    After switching my forwarders to public resolvers, that zen.spamhaus.org was returning NXDOMAIN.

    So, I began some basic testing, and it seems both GoogleDNS and Level3 are returning NXDOMAIN when using a zen.spamhaus.org test domain. OpenDNS appears to be resolving zen.spamhaus.org without any issues.

    # google public dns
    $ host
    Host not found: 3(NXDOMAIN)

    $ host
    Host not found: 3(NXDOMAIN)

    # level3 dns
    $ host
    Host not found: 3(NXDOMAIN)

    # opendns
    $ host has address

    $ host has address

    So a word of warning if you do use public resolvers, that it might have unexpected results.

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