_spf.gestiondeservidor.net has no CNAME records.
Question and response
Question
dig _spf.gestiondeservidor.net. NS
Answer
The response has no answer records.
Authority
gestiondeservidor.net. 3600 SOA dns1.gestiondeservidor.net. hostmaster.gestiondeservidor.net. 1356 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0