dns2.haeahn.com has no MX records.
Question and response
Question
dig dns2.haeahn.com. MX
Answer
The response has no answer records.
Authority
haeahn.com. 86400 SOA ns.gabia.co.kr. hosting.gabia.com. 2023101710 1800 600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0