cdc-ns.cvgs.net has no MX records.
Question and response
Question
dig cdc-ns.cvgs.net. MX
Answer
The response has no answer records.
Authority
cvgs.net. 900 SOA odcid7.concentrix.net. james\.stegemeyer.concentrix.com. 2014063989 10800 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0