d.nic.gd has no MX records.
Question and response
Question
dig d.nic.gd. MX
Answer
The response has no answer records.
Authority
nic.gd. 3600 SOA a.nic.gd. hostmaster.centralnic-dns.com. 1740022421 300 300 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0