mx.double-d-productions.com has no MX records.
Question and response
Question
dig mx.double-d-productions.com. MX
Answer
The response has no answer records.
Authority
double-d-productions.com. 3600 SOA dns.double-d-productions.com. hostmaster.double-d-productions.com. 1577080015 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0