mail.visp.com.ua has no CNAME records.
Question and response
Question
dig mail.visp.com.ua. NS
Answer
The response has no answer records.
Authority
visp.com.ua. 10800 SOA ns1.visp.com.ua. admin.visp.net.ua. 2025070301 28800 7200 1209600 28800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0