mail.uvtc.net has no CNAME records.
Question and response
Question
dig mail.uvtc.net. NS
Answer
The response has no answer records.
Authority
uvtc.net. 1558 SOA ns1.a3network.se. a3foretag.dinsupport.se. 2026022000 43200 7200 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0