_spf.amis.net has no CNAME records.
Question and response
Question
dig _spf.amis.net. NS
Answer
The response has no answer records.
Authority
amis.net. 3600 SOA ns1.amis.net. hostmaster.amis.net. 2025052900 28800 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0