ns02.aduanas.gob.do has no MX records.
Question and response
Question
dig ns02.aduanas.gob.do. MX
Answer
The response has no answer records.
Authority
aduanas.gob.do. 3600 SOA sdq-dns01. administrator.aduanas.gob.do. 200905591 7200 1200 1296000 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0