mx.apartamentosquintero.com has no NS records.
NS records for this zone are defined at apartamentosquintero.com.
NS records for this zone are defined at apartamentosquintero.com.
Question and response
Question
dig mx.apartamentosquintero.com. NS
Answer
The response has no answer records.
Authority
apartamentosquintero.com. 3600 SOA dns.apartamentosquintero.com. hostmaster.apartamentosquintero.com. 1464522298 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0