ns1.IPOWER.com has no MX records.
Question and response
Question
dig ns1.IPOWER.com. MX
Answer
The response has no answer records.
Authority
IPOWER.com. 3600 SOA ns1.ipowerweb.net. hostmaster.ipowerweb.net. 2007042301 80000 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0