mx0.spamcloud.md has no CNAME records.
Question and response
Question
dig mx0.spamcloud.md. NS
Answer
The response has no answer records.
Authority
spamcloud.md. 10617 SOA ns1.host.md. noc.host.md. 2025052001 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0