www.sparklight.net has no MX records.
Question and response
Question
dig www.sparklight.net. MX
Answer
The response has no answer records.
Authority
sparklight.net. 900 SOA ns1.cableone.net. dnsadmin.cableone.net. 57 10800 3600 2592000 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0