smtp-dev.rumahweb.net has no MX records.
Question and response
Question
dig smtp-dev.rumahweb.net. MX
Answer
The response has no answer records.
Authority
rumahweb.net. 3600 SOA dns3.cloudns.net. support.cloudns.net. 2026021903 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0