_spf.interior.edu.uy has no CNAME records.
Question and response
Question
dig _spf.interior.edu.uy. NS
Answer
The response has no answer records.
Authority
interior.edu.uy. 338 SOA guabiyu.interior.edu.uy. contacto-dns.cci.edu.uy. 2025122201 86400 7200 3600000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0