ns4.rumahweb.net has no MX records.
Question and response
Question
dig ns4.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