dns04.ports.net has no MX records.
Question and response
Question
dig dns04.ports.net. MX
Answer
The response has no answer records.
Authority
ports.net. 3600 SOA ns1.p201.dns.oraclecloud.net. registry.ports.net. 2026010500 3600 1800 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0