mx.rn.eastua.net has no MX records.
Question and response
Question
dig mx.rn.eastua.net. MX
Answer
The response has no answer records.
Authority
eastua.net. 3600 SOA ns.eastua.net. hostmaster.eunic.net.ua. 2026020501 3600 1800 1209600 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0