mx2.mxge.comcast.net has no CNAME records.
Question and response
Question
dig mx2.mxge.comcast.net. NS
Answer
The response has no answer records.
Authority
mxge.comcast.net. 46 SOA gtd03-d.northlake.il.ndcchgo.comcast.net. hostmaster.gtd03-d.northlake.il.ndcchgo.comcast.net. 2024022803 10800 3600 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0