relay-internal01.cbncloud.net has no MX records.
Question and response
Question
dig relay-internal01.cbncloud.net. MX
Answer
The response has no answer records.
Authority
cbncloud.net. 3600 SOA ns1.cbncloud.net. domain.cbncloud.co.id. 2026012901 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0