mail.garlic.net has no CNAME records.
Question and response
Question
dig mail.garlic.net. NS
Answer
The response has no answer records.
Authority
garlic.net. 344 SOA ns.garlic.com. support.garlic.com. 2015111300 3600 300 604800 7300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0