_spf.sendgrid.kubra.com has no MX records.
Question and response
Question
dig _spf.sendgrid.kubra.com. MX
Answer
The response has no answer records.
Authority
kubra.com. 3600 SOA pdns112.ultradns.com. admin.kubra.com. 2023057439 3600 900 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0