hcm-server1.vnn.vn has no MX records.
Question and response
Question
dig hcm-server1.vnn.vn. MX
Answer
The response has no answer records.
Authority
vnn.vn. 300 SOA vdc-hn01.vnn.vn. postmaster.vnn.vn. 2025123002 150 300 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0