mail.hostdime.com has no CNAME records.
Question and response
Question
dig mail.hostdime.com. NS
Answer
The response has no answer records.
Authority
hostdime.com. 120 SOA ns1.dimenoc.com. network.dimenoc.com. 2019063476 300 300 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0