mail.z-net.hu has no MX records.
Question and response
Question
dig mail.z-net.hu. MX
Answer
The response has no answer records.
Authority
z-net.hu. 300 SOA ns1.zt.hu. postmaster.zt.hu. 2025121100 28800 7200 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0