sdi.net.do has no MX records.
Question and response
Question
dig sdi.net.do. MX
Answer
The response has no answer records.
Authority
sdi.net.do. 7200 SOA dns1.midominio.do. enmanuel.gomez.claro.net.do. 2025101101 7200 7200 172800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0