mx02.grodno.by has no CNAME records.
Question and response
Question
dig mx02.grodno.by. NS
Answer
The response has no answer records.
Authority
grodno.by. 10800 SOA ns1.grodno.by. alexb.grodno.by. 2026021301 10800 3600 1814400 36000
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0