cpanelemaildiscovery.cpanel.net has no MX records.
Question and response
Question
dig cpanelemaildiscovery.cpanel.net. MX
Answer
The response has no answer records.
Authority
cpanel.net. 300 SOA c.cpanel.net. dns.cpanel.net. 2026030901 1200 7200 1600000 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0