ii.gov.do has no MX records.
Question and response
Question
dig ii.gov.do. MX
Answer
The response has no answer records.
Authority
ii.gov.do. 30 SOA ns1-05.azure-dns.com. hostmaster.dgii.gov.do. 1752 3600 600 604800 30
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0