bulkmail.sitea.com has no NS records.
NS records for this zone are defined at sitea.com.
NS records for this zone are defined at sitea.com.
Question and response
Question
dig mail.sitea.com. NS
Answer
The response has no answer records.
Authority
sitea.com. 300 SOA ns5.altamiraweb.com. hosting.sitea.com. 2005082175 3600 600 1209600 300
Additional
. 0 OPT ; payload 1224, xrcode 0, version 0, flags 0