_spf.ati.tn has no CNAME records.
Question and response
Question
dig _spf.ati.tn. NS
Answer
The response has no answer records.
Authority
ati.tn. 4573 SOA ns4.ati.tn. hostmaster.ati.tn. 2026023509 21600 7200 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0