mail.fensolutions.com has no NS records.
NS records for this zone are defined at fensolutions.com.
NS records for this zone are defined at fensolutions.com.
Question and response
Question
dig mail.fensolutions.com. NS
Answer
The response has no answer records.
Authority
fensolutions.com. 1800 SOA ns1.mydyndns.org. zone-admin.dyndns.com. 2012120911 10800 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0