_spf.linxtelecom.com has no CNAME records.
Question and response
Question
dig _spf.linxtelecom.com. NS
Answer
The response has no answer records.
Authority
linxtelecom.com. 300 SOA ns.eunet.ee. hostmaster.eunet.ee. 2025102800 300 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0