webmail.proclean.uz has no CNAME records.
Question and response
Question
dig webmail.proclean.uz. NS
Answer
The response has no answer records.
Authority
proclean.uz. 10663 SOA ns01.uzsci.net. Alexandr\.perfect.gmail.com. 1739000973 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0