mail.mx.allytech.com has no CNAME records.
Question and response
Question
dig mail.mx.allytech.com. NS
Answer
The response has no answer records.
Authority
mx.allytech.com. 5802 SOA ns1.allytech.com. root.mx.allytech.com. 2024120414 7200 7200 2419200 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0