mail.alpha.interecm2.com has no CNAME records.
Question and response
Question
dig mail.alpha.interecm2.com. NS
Answer
The response has no answer records.
Authority
interecm2.com. 416 SOA ns17.domaincontrol.com. dns.jomax.net. 2025111704 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0