_spf.pool2.transactional-mail-a.com has no CNAME records.
Question and response
Question
dig _spf.pool2.transactional-mail-a.com. NS
Answer
The response has no answer records.
Authority
transactional-mail-a.com. 3303 SOA ns-612.awsdns-12.net. awsdns-hostmaster.amazon.com. 20250603 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0