_spf.valtti.com has no CNAME records.
Question and response
Question
dig _spf.valtti.com. NS
Answer
The response has no answer records.
Authority
valtti.com. 2063 SOA ns1.datacenter.fi. hostmaster.datacenter.fi. 2026022302 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0