mail.hostrd.com has no CNAME records.
Question and response
Question
dig mail.hostrd.com. NS
Answer
The response has no answer records.
Authority
hostrd.com. 3490 SOA dns1.hostrd.com. server.bitsandbytesmedia.com. 2026020501 3600 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0