keriomail.PCH.NET has no CNAME records.
Question and response
Question
dig keriomail.PCH.NET. NS
Answer
The response has no answer records.
Authority
pch.net. 600 SOA anyns.pch.net. hostmaster.pch.net. 2026022001 3600 600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0