smtp.shared.serverneubox.com.mx has no NS records.
NS records for this zone are defined at serverneubox.com.mx.
NS records for this zone are defined at serverneubox.com.mx.
Question and response
Question
dig smtp.shared.serverneubox.com.mx. NS
Answer
The response has no answer records.
Authority
serverneubox.com.mx. 1800 SOA ada.ns.cloudflare.com. dns.cloudflare.com. 2397088806 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0