smtp.cloudplatform.fi has no CNAME records.
Question and response
Question
dig smtp.cloudplatform.fi. NS
Answer
The response has no answer records.
Authority
cloudplatform.fi. 1577 SOA matt.ns.cloudflare.com. dns.cloudflare.com. 2396412960 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0