spf.lu.se has no CNAME records.
Question and response
Question
dig spf.lu.se. NS
Answer
The response has no answer records.
Authority
lu.se. 10056 SOA prim.lu.se. hostmaster.lu.se. 2026022528 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0