_spf.variosecure.net has no CNAME records.
Question and response
Question
dig _spf.variosecure.net. NS
Answer
The response has no answer records.
Authority
variosecure.net. 163 SOA ns0.ambisys.jp. hostmaster.ambisys.com. 2026021601 10800 1800 3600000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0