proxy.uniza.sk has no MX records.
Question and response
Question
dig proxy.uniza.sk. MX
Answer
The response has no answer records.
Authority
uniza.sk. 3600 SOA nic.uniza.sk. hostmaster.uniza.sk. 2026030303 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0