mail-dal.wowrack.com has no NS records.
NS records for this zone are defined at wowrack.com.
NS records for this zone are defined at wowrack.com.
Question and response
Question
dig mail-dal.wowrack.com. NS
Answer
The response has no answer records.
Authority
wowrack.com. 3600 SOA ns1.wowrack.com. support.wowrack.com. 16642 900 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0