_spf.datacenter.fi has no MX records.
Question and response
Question
dig _spf.datacenter.fi. MX
Answer
The response has no answer records.
Authority
datacenter.fi. 7200 SOA ns1.datacenter.fi. hostmaster.datacenter.fi. 2026020301 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0