firma.aspi.cz has no MX records.
Question and response
Question
dig firma.aspi.cz. MX
Answer
The response has no answer records.
Authority
aspi.cz. 60 SOA edns9.ultradns.biz. adeelahmed\.afghan.wolterskluwer.com. 2025072644 86400 86400 86400 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0