voip.net.do has no MX records.
Question and response
Question
dig voip.net.do. MX
Answer
The response has no answer records.
Authority
voip.net.do. 3600 SOA pns41.cloudns.net. support.cloudns.net. 2023060605 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0