nap.wideopenwest.com has no MX records.
Question and response
Question
dig nap.wideopenwest.com. MX
Answer
The response has no answer records.
Authority
nap.wideopenwest.com. 3600 SOA nap.wideopenwest.com. dwalden.wideopenwest.com. 2019061202 28800 14400 360000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0