mail.mail.cyberneticos.com has no NS records.
NS records for this zone are defined at mail.cyberneticos.com.
NS records for this zone are defined at mail.cyberneticos.com.
Question and response
Question
dig mail.mail.cyberneticos.com. NS
Answer
The response has no answer records.
Authority
mail.cyberneticos.com. 3600 SOA cybera.cyberneticos.com. hostmaster.mail.cyberneticos.com. 2025020201 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0