postfix.yota.com.ni has no NS records.
NS records for this zone are defined at yota.com.ni.
NS records for this zone are defined at yota.com.ni.
Question and response
Question
dig postfix.yota.com.ni. NS
Answer
The response has no answer records.
Authority
yota.com.ni. 1800 SOA henry.ns.cloudflare.com. dns.cloudflare.com. 2398568121 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0