dns4.arubadns.cz has no MX records.
Question and response
Question
dig dns4.arubadns.cz. MX
Answer
The response has no answer records.
Authority
arubadns.cz. 3600 SOA arudns1.aruba.it. hostmaster.arubadns.cz. 2025010201 86400 7200 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0