mail.hhos.net has no CNAME records.
Question and response
Question
dig mail.hhos.net. NS
Answer
The response has no answer records.
Authority
hhos.net. 3142 SOA ns1.hhos.net. hostmaster.hhos.net. 2026030647 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0