smtp.csc.fi has no CNAME records.
Question and response
Question
dig smtp.csc.fi. NS
Answer
The response has no answer records.
Authority
csc.fi. 775 SOA ns.funet.fi. hostmaster.funet.fi. 2026030517 10800 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0