spf1.tre.se has no CNAME records.
Question and response
Question
dig spf1.tre.se. NS
Answer
The response has no answer records.
Authority
tre.se. 447 SOA ns.hi3gaccess.se. hostmaster.tre.se. 2026030401 14400 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0