mx.twcc.ai has no CNAME records.
Question and response
Question
dig mx.twcc.ai. NS
Answer
The response has no answer records.
Authority
twcc.ai. 10731 SOA ns1.twcc.ai. hostmaster.twcc.ai. 2025120405 3600 1800 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0