transunion.net.do has no MX records.
Question and response
Question
dig transunion.net.do. MX
Answer
The response has no answer records.
Authority
transunion.net.do. 10800 SOA dns1.cscdns.net. hostmaster.cscdns.net. 2017081714 28800 7200 604800 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0