mx2.ugbb.net has no CNAME records.
Question and response
Question
dig mx2.ugbb.net. NS
Answer
The response has no answer records.
Authority
ugbb.net. 1657 SOA ns1.telemach.net. hostmaster.telemach.net. 2020112484 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0