_spf.uni5.net has no CNAME records.
Question and response
Question
dig _spf.uni5.net. NS
Answer
The response has no answer records.
Authority
uni5.net. 3600 SOA dns1.uni5.net. abuse.uni5.net. 2023011902 3600 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0