mxsmtp.wimaxtigo.bo has no NS records.
NS records for this zone are defined at wimaxtigo.bo.
NS records for this zone are defined at wimaxtigo.bo.
Question and response
Question
dig mxsmtp.wimaxtigo.bo. NS
Answer
The response has no answer records.
Authority
wimaxtigo.bo. 10800 SOA ns1.wimaxtigo.bo. hostmaster.wimaxtigo.bo. 2018082713 10800 900 1814400 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0