server3.mailix.mx has no NS records.
NS records for this zone are defined at mailix.mx.
NS records for this zone are defined at mailix.mx.
Question and response
Question
dig server3.mailix.mx. NS
Answer
The response has no answer records.
Authority
mailix.mx. 1800 SOA cruz.ns.cloudflare.com. dns.cloudflare.com. 2395666269 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0