_spf.zt.hu has no MX records.
Question and response
Question
dig _spf.zt.hu. MX
Answer
The response has no answer records.
Authority
zt.hu. 300 SOA ns1.zt.hu. postmaster.zt.hu. 2026021200 28800 7200 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0