_spf.controldeservidor.com has no MX records.
Question and response
Question
dig _spf.controldeservidor.com. MX
Answer
The response has no answer records.
Authority
controldeservidor.com. 3600 SOA ns1.controldeservidor.com. servidores.loading.es. 2025112501 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0