dns1.cscdns.net has no MX records.
Question and response
Question
dig dns1.cscdns.net. MX
Answer
The response has no answer records.
Authority
cscdns.net. 14400 SOA udns1.cscdns.net. hostmaster.cscdns.net. 2007080917 28800 7200 604800 14400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0