mx2.hanacke.net has no CNAME records.
Question and response
Question
dig mx2.hanacke.net. NS
Answer
The response has no answer records.
Authority
hanacke.net. 220 SOA nsa.hanackenet.cz. admin.hanacke.net. 2024042602 3600 300 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0