_spf.embluemail.com has no CNAME records.
Question and response
Question
dig _spf.embluemail.com. NS
Answer
The response has no answer records.
Authority
embluemail.com. 1793 SOA brenda.ns.cloudflare.com. dns.cloudflare.com. 2397190956 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0