ns.buneh.com.br has no MX records.
Question and response
Question
dig ns.buneh.com.br. MX
Answer
The response has no answer records.
Authority
buneh.com.br. 86400 SOA ns1-noctua.myscriptcase.host. host.netmake.com.br. 2026022203 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0