ncw2.mail.chartercom.com has no CNAME records.
Question and response
Question
dig ncw2.mail.chartercom.com. NS
Answer
The response has no answer records.
Authority
chartercom.com. 5 SOA ns1.charter.com. hostmaster.charter.com. 2025060161 43200 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0