ns.iis5.net has no MX records.
Question and response
Question
dig ns.iis5.net. MX
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 4000, xrcode 0, version 0, flags 0