mx1.ugbb.net has no CNAME records.
Question and response
Question
dig mx1.ugbb.net. NS
Answer
The response has no answer records.
Authority
ugbb.net. 972 SOA ns1.telemach.net. hostmaster.telemach.net. 2020112484 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0