mail7.dptagent.net has no MX records.
Question and response
Question
dig mail7.dptagent.net. MX
Answer
The response has no answer records.
Authority
dptagent.net. 3600 SOA pdns01.domaincontrol.com. dns.jomax.net. 2025050904 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0