esac.edu.do has no MX records.
Question and response
Question
dig esac.edu.do. MX
Answer
The response has no answer records.
Authority
esac.edu.do. 60 SOA 208.91.197.91. hostmaster.esac.edu.do. 1772556366 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0