mail.server.unisnorte.edu.do has no MX records.
Question and response
Question
dig mail.server.unisnorte.edu.do. MX
Answer
The response has no answer records.
Authority
server.unisnorte.edu.do. 86400 SOA ns19092188167.a2dns.com. root.server.unisnorte.edu.do. 2026012500 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0