mail.merlindream.com has no NS records.
NS records for this zone are defined at merlindream.com.
NS records for this zone are defined at merlindream.com.
Question and response
Question
dig mail.merlindream.com. NS
Answer
The response has no answer records.
Authority
merlindream.com. 3600 SOA dns.merlindream.com. hostmaster.merlindream.com. 1326511048 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0