fw.blue4.cz has no MX records.
Question and response
Question
dig fw.blue4.cz. MX
Answer
The response has no answer records.
Authority
blue4.cz. 3600 SOA ns.edera.cz. admin.edera.cz. 2026030603 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0