spf.online.no has no MX records.
Question and response
Question
dig spf.online.no. MX
Answer
The response has no answer records.
Authority
online.no. 600 SOA ns1.nextra.no. hostmaster.telenor.net. 2026021600 3600 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0