mail.scinet.uz has no CNAME records.
Question and response
Question
dig mail.scinet.uz. NS
Answer
The response has no answer records.
Authority
scinet.uz. 7453 SOA ns08.uzsci.net. webmaster.uzsci.net. 1543477803 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0