mail.fensolutions.com has no CNAME records.
Question and response
Question
dig mail.fensolutions.com. NS
Answer
The response has no answer records.
Authority
fensolutions.com. 1604 SOA ns1.mydyndns.org. zone-admin.dyndns.com. 2012120911 10800 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0