mail.hostujemy.to has no CNAME records.
Question and response
Question
dig mail.hostujemy.to. NS
Answer
The response has no answer records.
Authority
hostujemy.to. 600 SOA dns1.supermedia.pl. dns.supermedia.pl. 2026022602 28800 7200 864000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0