mail.garlic.com has no CNAME records.
Question and response
Question
dig mail.garlic.com. NS
Answer
The response has no answer records.
Authority
garlic.com. 10800 SOA ns.garlic.com. support.garlic.com. 2025121601 3600 300 604800 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0