ns1.gabia.net has no MX records.
Question and response
Question
dig ns1.gabia.net. MX
Answer
The response has no answer records.
Authority
ns1.gabia.net. 86400 SOA ns.gabia.co.kr. hosting.gabia.com. 2023011503 1800 600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0