mail.miconet.pl has no CNAME records.
Question and response
Question
dig mail.miconet.pl. NS
Answer
The response has no answer records.
Authority
miconet.pl. 894 SOA dns.miconet.pl. das.miconet.pl. 2024071502 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0