_spf.dnsever.com has no CNAME records.
Question and response
Question
dig _spf.dnsever.com. NS
Answer
The response has no answer records.
Authority
dnsever.com. 6855 SOA ns7.dnsever.com. admin.dnsever.com. 1747039760 86400 600 1209600 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0