mta-rfxt.cluster2.blackbaud.net has no CNAME records.
Question and response
Question
dig mta-rfxt.cluster2.blackbaud.net. NS
Answer
The response has no answer records.
Authority
blackbaud.net. 60 SOA ns1.p13.dynect.net. dns.jomax.net. 2023050102 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0