park.broker.mx has no MX records.
Question and response
Question
dig park.broker.mx. MX
Answer
The response has no answer records.
Authority
broker.mx. 3601 SOA freedns1.registrar-servers.com. hostmaster.registrar-servers.com. 1771207663 43200 3600 604800 3601
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0