pub4lb.active24.cz has no MX records.
Question and response
Question
dig pub4lb.active24.cz. MX
Answer
The response has no answer records.
Authority
active24.cz. 3600 SOA alfa.ns.active24.cz. hostmaster.active24.cz. 2026022703 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0