mail.htctech.net has no CNAME records.
Question and response
Question
dig mail.htctech.net. NS
Answer
The response has no answer records.
Authority
htctech.net. 900 SOA ns.htc.net. postmaster.ns.htc.net. 2024013002 1800 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0