_spf.stejtech.net has no CNAME records.
Question and response
Question
dig _spf.stejtech.net. NS
Answer
The response has no answer records.
Authority
stejtech.net. 3578 SOA ns1.electric.net. dns.electric.net. 1484593581 10000 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0