_spf.kubra.com has no CNAME records.
Question and response
Question
dig _spf.kubra.com. NS
Answer
The response has no answer records.
Authority
kubra.com. 2043 SOA pdns112.ultradns.com. admin.kubra.com. 2023057439 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0