hosting.m-zone.cz has no MX records.
Question and response
Question
dig hosting.m-zone.cz. MX
Answer
The response has no answer records.
Authority
m-zone.cz. 3600 SOA ns.m-zone.cz. root.m-zone.cz. 2025111907 3600 3600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0