_spf.t-2.si has no CNAME records.
Question and response
Question
dig _spf.t-2.si. NS
Answer
The response has no answer records.
Authority
t-2.si. 900 SOA dns1.t-2.si. dns.t-2.si. 1765896941 28800 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0