correo.plexus.es has no NS records.
NS records for this zone are defined at plexus.es.
NS records for this zone are defined at plexus.es.
Question and response
Question
dig correo.plexus.es. NS
Answer
The response has no answer records.
Authority
plexus.es. 1800 SOA bob.ns.cloudflare.com. dns.cloudflare.com. 2397421609 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0