mail.cniteam.com has no NS records.
NS records for this zone are defined at cniteam.com.
NS records for this zone are defined at cniteam.com.
Question and response
Question
dig mail.cniteam.com. NS
Answer
The response has no answer records.
Authority
cniteam.com. 300 SOA primary.dns.bright.net. hostmaster.bright.net. 202603102 300 300 300 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0