fw.designplus.cz has no MX records.
Question and response
Question
dig fw.designplus.cz. MX
Answer
The response has no answer records.
Authority
designplus.cz. 3600 SOA diana.designplus.cz. domeny.designplus.cz. 2025060203 3600 600 24192000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0