mx2.boysmania.com.br has no NS records.
NS records for this zone are defined at boysmania.com.br.
NS records for this zone are defined at boysmania.com.br.
Question and response
Question
dig mx2.boysmania.com.br. NS
Answer
The response has no answer records.
Authority
boysmania.com.br. 3600 SOA a10-dns-uolcsfe1.host.intranet. root.uol.com.br. 2012060757 7200 3600 432000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0