ba3.mta.exacttarget.com has no NS records.
NS records for this zone are defined at mta.exacttarget.com.
NS records for this zone are defined at mta.exacttarget.com.
Question and response
Question
dig ba3.mta.exacttarget.com. NS
Answer
The response has no answer records.
Authority
mta.exacttarget.com. 3600 SOA dns1.p01.nsone.net. hostmaster.nsone.net. 264 3 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0