mx1.dabcnet.net has no CNAME records.
Question and response
Question
dig mx1.dabcnet.net. NS
Answer
The response has no answer records.
Authority
dabcnet.net. 3495 SOA nsa01.corp.dblc.io. admin.dabcnet.net. 2026020502 300 300 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0