smtp.paskov.cz has no MX records.
Question and response
Question
dig smtp.paskov.cz. MX
Answer
The response has no answer records.
Authority
paskov.cz. 7200 SOA ns.paskov.net. hostmaster.paskov.cz. 2024040417 14400 3600 2419200 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0