mail.arhat.uz has no CNAME records.
Question and response
Question
dig mail.arhat.uz. NS
Answer
The response has no answer records.
Authority
arhat.uz. 5264 SOA hosting.scinet.uz. admin.arhat.uz. 1768889723 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0