mail.hostchocolatebox.com has no CNAME records.
Question and response
Question
dig mail.hostchocolatebox.com. NS
Answer
The response has no answer records.
Authority
hostchocolatebox.com. 2637 SOA ns1.hostchocolate.com. hostmaster.hostchocolatebox.com. 2025110102 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0