securemail.iis5.net has no CNAME records.
Question and response
Question
dig securemail.iis5.net. NS
Answer
The response has no answer records.
Authority
iis5.net. 3600 SOA ns.iis5.net. lovekt.hotmail.com. 164 54000 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0