MailEnable Enterprise Guide
Appendix / DNS error codes and descriptions
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    DNS error codes and descriptions
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    The following table lists typical WIN32 DNS return codes. These return codes may appear in the SMTP Debug log file if the DNS is either incorrectly configured or there are DNS Errors being returned from the DNS Server.

    9001

    DNS server unable to interpret format.

    9002

    DNS server failure.

    9003

    DNS name does not exist.

    9004

    DNS request not supported by name server.

    9005

    DNS operation refused.

    9006

    DNS name that should not exist, does exist.

    9007

    DNS RR set that ought not to exist, does exist.

    9008

    DNS RR set that ought to exist, does not exist.

    9009

    DNS server not authoritative for zone.

    9010

    DNS name in update or prereq is not in zone.

    9016

    DNS signature failed to verify.

    9017

    DNS bad key.

    9018

    DNS signature validity expired.

    9501

    No records found for given DNS query

    9502

    Bad DNS packet

    9503

    No DNS packet 9504: DNS error, check rcode

    9505

    Unsecured DNS packet

    1460

    Timeout - This operation returned because the timeout period expired