mx.ogilvydevelopment.cz has no CNAME records.
Question and response
Question
dig mx.ogilvydevelopment.cz. NS
Answer
The response has no answer records.
Authority
ogilvydevelopment.cz. 3472 SOA ns1.webglobe.cz. root.webglobe.cz. 2026021201 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0