glencoremail2.okay.pl has no CNAME records.
Question and response
Question
dig glencoremail2.okay.pl. NS
Answer
The response has no answer records.
Authority
okay.pl. 2821 SOA ns80.zetosa.com.pl. dns.zetosa.com.pl. 2026022000 3600 600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0