_spf.bubblesmail.net has no CNAME records.
Question and response
Question
dig _spf.bubblesmail.net. NS
Answer
The response has no answer records.
Authority
bubblesmail.net. 9 SOA ns49.domaincontrol.com. dns.jomax.net. 2023091900 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0