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Note:

On servers that run CentOS 7, you may see a named warning about the absence of SPF resource records on DNS.

  • This warning is not relevant on CentOS 7 servers, because RFC 7208 deprecated SPF records. CentOS 7 servers use TXT records instead of SPF records.
  • Red Hat 7.1 and CentOS 7.1 both contain bind-9.9.4-23.el7, which is an updated version of bind that complies with RFC 7208. To resolve this issue, update your operating system to a version that contains the updated version of bind. For more information, read the the Red Hat Bugzilla case about SPF record errors.
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