smtp02-outbound.orange.sk has no MX records.
Question and response
Question
dig smtp02-outbound.orange.sk. MX
Answer
The response has no answer records.
Authority
orange.sk. 3600 SOA ns1.orange.sk. root.ns1.orange.sk. 2026022601 7200 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0