com.do has no MX records.
Question and response
Question
dig com.do. MX
Answer
The response has no answer records.
Authority
com.do. 3600 SOA ns1.nic.do. hostmaster.nic.do. 2026022203 3600 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0