cid.cmpsrv.com has no MX records.
Question and response
Question
dig cid.cmpsrv.com. MX
Answer
The response has no answer records.
Authority
cmpsrv.com. 300 SOA ns.compositiv.com. info.compositiv.com. 2026021939 3600 600 604800 300
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0