mx1.suomicom.fi has no CNAME records.
Question and response
Question
dig mx1.suomicom.fi. NS
Answer
The response has no answer records.
Authority
suomicom.fi. 2728 SOA ns1.suomicom.fi. domains.suomicom.fi. 1764170900 28800 3600 864000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0