dnvr-ldap-02.host.ctl.one has no MX records.
Question and response
Question
dig dnvr-ldap-02.host.ctl.one. MX
Answer
The response has no answer records.
Authority
host.ctl.one. 300 SOA ns3.level3.net. postmaster.ns3.level3.net. 2026012700 300 240 86400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0