smtp2d.hosting90.cz has no CNAME records.
Question and response
Question
dig smtp2d.hosting90.cz. NS
Answer
The response has no answer records.
Authority
hosting90.cz. 3600 SOA ns1.webglobe.cz. root.webglobe.cz. 2026030804 7200 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0